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• LP Research Notebooks, RNB 09 RE: Density of EuSO4. [Filed under LP Research Notebooks: Research Notebook 9: 007]
• LP Research Notebooks, RNB 09 RE: Electron diffraction data-BaSO4 [March 1937?] [Filed under LP Research Notebooks: Research Notebook 9: 004]
• LP Research Notebooks, RNB 09 RE: Electron diffraction data-EuSO4, BaSO4 [March 1937?] [Filed under LP Research Notebooks: Research Notebook 9: 005]

• AHP writes cheque to: Edwin J. Porter amount $4.40 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from Francis G. Blake, Medical Fellowship Board, National Research Council to LP RE: Mr. Thomas Harrison Davies has been appointed a Fellowship to work under LP's direction for the 1938-39 year. [LP's reply to Blake March 8, 1938] [LP Science Box 14.027, Folder 3]
• Letter from Gerald Wendt to LP RE: Asks LP to once again review Lassettre's review on Hydrogen Bonding. Dr. Carsten C. Steffens has also reviewed the article and has strong criticisms towards it. [LP's response: March 9, 1937] [Filed under C: Organizational Correspondence: Box #70.5, file: Chemical Reviews]

• AHP writes cheque to: Lola Cook amount $60 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from A. C. Menzies to LP RE: Menzies thanks LP for his reasonable and grateful criticism of Hunter's work. [Murphy's letter: April 24, 1937] [Filed under: M: Correspondence, Box #255.4]
• Letter from LP to Professor R. E. Swain, Stanford, RE: asking permission to let Dr. Springall use a certain apparatus at Stanford to prepare trimethylphosphine. [Filed under: S: Correspondence, Box #377.7]
• Letter from W. A. Noyes to Dr. Wilson RE: Noyes is sorry to learn that he has decided to publish his Monograph with McGraw Hill, Co. [Filed under: N: Individual Correspondence, Box #279.3]

• AHP writes cheque to: Sanitary Laundry Co., amount $4.86 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: The Hoover Co., amount $2.01 [Filed under LP Biographical: Box #4.014, Folder #1]
• LP writes cheque to: Collector of Internal Revenue amount $26.55 [Filed under LP Biographical: Box #4.014, Folder #1]
• LP writes cheque to: Treasurer, State of California amount $11.08 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from LP to Dr. W.T. Astbury RE: Astbury's visit to the States over Easter. LP invites him to stay in Pasadena and recommends he visit Stanford and Berkeley during his stay. [Astbury's letter to LP February 17, 1937] [Filed under LP Correspondence: Box #6.18, file: Astbury, William T.)]
• Letter from LP to Edwin R. Buchman RE: Explains that he is turning over the possibility of Buchman coming to California Tech to the Chemistry Division Council and once a decision is made LP plans to let Buchman know. [Buchman's letter: February 26, 1937] [LP's next letter April 15, 1937] [Filed under LP Correspondence: Box #33.2, file: (Buchman, Edwin R. 1936-1960)]
• Letter from LP to George Glockler RE: Apologizes that he may have given the impression that Dr. Klug was not suitable for the position but simply believes others may be more equipped for it. For example, Dr. Brockway and Dr. Coryell for CIT. [Filed under: G: Individual Correspondence, Box #136.15]
• Letter from LP to Mr. Myron Murphy RE: LP is sorry to learn that he will be unable to accept the fellowship but hopes to see him in future years. [Murphy's letter: February 25, 1937] [Filed under: M: Correspondence, Box #255.4]
• Letter from LP to Professor W. A. Noyes RE: LP discusses various scientific work with Noyes. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter from LP to Professor W. A. Noyes RE: LP thinks the outline of Dr. Bailar's book is thoroughly satisfactory. [Filed under: N: Individual Correspondence, Box #279.3]

• AHP writes cheque to: Katharine Putnam Crane amount $85 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Stage amount $5 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from Roger J. Williams to LP RE: Thanks LP for his prompt report on the calcium salt sample. [Filed under: Williams, Roger, J. Box #436.2]
• Letter from W. A. Noyes to LP, Clark, and Lind RE: Noyes informs the Board who have been voted successor to Professor Stieglitz. Noyes has discusses with Roger Adams that it would be best to take his name off the list as he is already associated with the University of Ill. and Noyes believes it would be best to choose a man from Harvard, for example, in order to have better geographical distribution. [Filed under: N: Individual Correspondence, Box #279.3]
• Note from D. P. Mellor to LP RE: Thanks LP for helping in some of the questions asked in his previous letter. Looks forward to seeing LP around September 4. [Filed under: M: Individual Correspondence, Box #246.7]

• AHP writes cheque to: Bode's amount $5 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from LP to Dr. D. M. Wrinch RE: LP would be pleased if Wrinch were to visit CIT next winter. If coming to Pasadena during the winter does not work out, he suggests she come to Cornell during the fall. [Filed under: W: Individual Correspondence, Box #438.12]
• Letter from LP to Dr. Gerald Wendt RE: Explains that he has not been able to make a decision regarding the three papers of the critical state. Suggests that the paper by W. H. Barnes be published before the other two. [Filed under C: Organizational Correspondence: Box #70.5, file: Chemical Reviews]
• Letter from LP to Warren Weaver, Director, The Natural Sciences-Rockefeller Foundation. [Weaver's letter to LP February 11, 1937] [LP Science Box 14.038, Folder 5]

  Dr. Warren Weaver

  The Rockefeller Foundation

  49 West 49th Street

  New York, New York

  Dear Dr. Weaver:

  I haven’t yet seen Dorothy Wrinch’s long paper in the Proceedings of the Royal Society, but I have read her shorter papers on the structure of proteins and on chromosome structure, as well as some of her earlier mathematical work, ten or fifteen years ago. I have the impression that she is a very clever person, and I am sympathetic to the type of speculative consideration which she is carrying on now. Without doubt there is a great deal of truth in her general picture. This picture is, however still very far from definite - she suggests various alternatives and does not make any definite predictions. I have felt that the definite suggestion which she did make regarding protein structure, dealing with a type of polypeptide condensation involving hexagonal rings, is incorrect, since Mirsky and I came to the conclusion from the consideration of available experimental facts that the structure of native proteins is determined by hydrogen bond linkages; however, Dr. Wrinch has said recently in a letter to Nature that she is willing to revise her picture by introducing hydrogen bonds.

  Some fifteen years ago a number of people indulged in extensive speculations regarding the structure of crystals, using the self-consistency of their systems as criteria rather than test by experimental methods. Despite the nicely symmetric structures which they proposed, these speculations have turned out to be wrong. I feel that Dr. Wrinch’s work suffers a little bit from being similarly too speculative and from being based too largely on the assumption that nicely symmetrical structures are the right ones.

  On the other hand, she seems to be conversant with what facts there are, and it is quite possible that the attempts to coordinate them with structural ideas will ultimately be of value in the solution of the great problem of protein structure.

  I forgot to tell you that I am going to be at Cornell during the first semester of next year, giving the George Fisher Baker Lecutres in Chemistry. Dr. Wrinch has written saying that she would like to come to Pasadena for a visit next year, if it could be arranged, and I have answered that I would like to see her come here some time after February 15th, or, if that were not possible, come to Cornell during the fall semester. I would like very much to have a chance to talk over these problems with her, and I hope that her plan can be carried out.

  With best regards, I am

  Sincerely yours,

  Linus Pauling

• AHP writes cheque to: Ray Huff Studio amount $20 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from A. W. Shaffer to LP RE: Asks LP if he is in a position to submit an offer on the Hartwood property. [Filed under: R: Correspondence, Box #340.2]
• Letter from LP to Francis G. Blake, Chairman of the Medical Fellowships Board, National Research Council RE: LP is pleased to learn that Mr. Thomas Harrison Davies has been awarded a National Research Fellowship and intends to work at the Gates and Crellin Laboratories. [Blake's letter to LP March 1, 1938] [LP Science Box 14.027, Folder 3]
• Letter from LP to Thomas Harrison Davies, Dept. of Physiological Chemistry, The Johns Hopkins School of Medicine RE: LP is pleased the Davies will be coming to C. I. T. as a National Research Fellow. He would like to know the time of Davies' arrival and what his research plans are. [LP Science Box 14.027, Folder 3]

• LP writes cheque to: H. L. Miller Company amount $7.16 [Filed under LP Biographical: Box #4.014, Folder #1]
• LP writes cheque to: Reed and Miller amount $11.43 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from F. M. Turner to Noyes RE: Discusses with Noyes whom is best fit to succeed Professor Steiglitz as member of the Board, at this time he believes that Professor Midgley is the best choice. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP is irritated that the punctuation in his manuscript with Coryell and Stitt ("Magnetic Properties - Ferrihemoglobin") was altered by the Journal's typesetter and requests that the original punctuation be restored. [Reply from Bliss March 15, 1937] [LP Science Box 14.002, Folder 3]
• Letter from LP to Dr. Gerald Wendt RE: Explains that the changes Dr. Steffens suggested for Lassettre's article have been made and now seem fit for publication. [Wendt's letter: March 1, 1937] [Filed under LP Correspondence: Box #70.5, file: Chemical Reviews]

• A.H. Shaw amount $3
• AHP writes cheque to: F. C. Nash and Co., amount $9.01 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from Carl L. Alsberg to LP RE: sending a reprint collection regarding the gluten project and asks them to be returned when he is finished. [Filed under LP Correspondence: A: Correspondence, Box #12.3]
• Letter from LP to Mr. A. W. Shaffer RE: LP thanks Shaffer for the information regarding the Hart property but regrets to say that the parcel is too large to handle alone. [Filed under: R: Correspondence, Box #340.2]

• Letter from LP to Dr. E. A. Guggenheim RE: Reports that another set of reprints have been sent. Is glad to hear that he enjoyed his meeting with Wheland. [Filed under G: Correspondence, Box #140.2]
• Letter from LP to Dr. G. W. Wheland. [Filed under: LP Books, Unpb5.9]

  Dr. G. W. Wheland

  18 Romney Court

  Shepherds Bush, Green

  London, W. 12.

  Dear George,

  I am writing to your London address, though I do not know for sure that you have not moved during the months since I wrote last. I feel that I am able to write, now that the typed script of Chapters I and II of the book have finally been sent. I continue to be as busy as during the first part of this year, and how strong the prospects are of getting a large amount of writing done during the next few months can only be guessed. Perhaps my conscience will begin to hurt pretty soon, however. Have you anything more to send me? I am looking to you to learn the point of view of the English chemists thoroughly and to see that our book is written in a way that is satisfactory to them. I was interested to learn that Lennard-Jones and Penney had decided that the double bond radii should be reduced somewhat. You know that for the last two or three years Brockway and I have been slowly getting data on hydrocarbons, and we too had decided on the value 1.34 Å for the carbon-carbon double bond, on the basis of electron diffraction measurements on ethylene, allene, and various substituted ethylenes. The experimental evidence for the earlier value of 1.38 was almost non-existent. I chose this value by lineal interpolation between single bond and triple bond values. This was supported by the band spectroscopic data on the ³ and ¹ state of the oxygen molecule, which now offer a problem, since they have r values about 0.06 Å larger than the double bond distance. The resonance curve is now changed in the region between single bond and half and half bond, so that practically all of the earlier arguments are still valid. This work will be published shortly in the J.A.C.S.

  Perhaps you noticed that Brockway had pulled a boner in his identification of the epoxybutanes. He has now repeated the work, using models in which the strain is distributed among five bond angles, and has reached the opposite identification.

  We have got some interesting results on acetone. Levy found that trigonal bonds in B(CH₃)₃ gave boron a radius of 0.1 Å less that its usual radius. We have found the carbon-carbon bonds in acetone to be very short, apparently as the result of a large contribution of a semi-polar double bond type of structure in which carbon forms only three single bonds.

  Coryell and Stitt are continuing to make hemoglobin measurements. Stitt is applying for a National Research Fellowship and may be at Harvard during the first semester. I shall be at Cornell from September to February, giving the Baker Lectures. Sturdivant will lecture here on crystal structure during this time, and I shall take over the course here on returning. I think the chances are good that Brockway will get he Guggenheim Fellowship, since he received a request for an estimated budget, just as you did last year. He is working hard to finish a number of investigations before summer comes. The two Oxford men here as Commonwealth Fellows, Hampson and Springall, have been making some interesting studies, Hampson having determined the structure of P₄O₁₀, as well as of P₄O₆ and As₄O₆. P₄O₆ shows some anomalously small phosphorus-oxygen distances.

  Isn’t Shepherd’s Bush the place where dog races are held in London? I am sure that you and Mrs. Wheland are having a fine time, and I suppose that you are planning to breast the crowds in order to see the Coronation Procession.

  I trust that you enjoyed your trip to Italy, and that you are not forgetting to see as much of the country as possible.

  [Linus Pauling]

• Letter from LP to Dr. L. E. Sutton RE: Is glad to hear of some of the gossip about the English professorships, which Sutton wrote about in his last letter. LP offers to do anything he can to help boost his status. LP finds Sutton's results on tetrahalides very interesting. [Filed under: S: Individual Correspondence, Box #370.8]
• Letter from LP to Mr. Jean Willems RE: Recommends Charles Degard for an associate Fellowship of the F. N. R. S. Explains that Degard has worked with him for six months and he has been very impressed with his work thus far. [Filed under: Degard, Charles, 1936-1940: Box #91.1]
• Letter from LP to Professor Noyes RE: LP casts his vote for Henry Gilman but in case a East coast man is desired LP votes for E. P. Kohler. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter from W. A. Noyes to LP RE: Noyes encloses a copy of a letter received from Mr. Turner and informs LP that if he wishes to vote again he may do so. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter from Warren Weaver, Director, The Natural Sciences-Rockefeller Foundation to LP RE: Thanking him for his comments on Wrinch's work. He is interested to know that LP expects to be at Cornell for the first half of next year. He hopes the Wrinch will not come to the U. S. Because he feels it is more important for her to stay at home and develop her own ideas more thoroughly. [LP Science Box 14.038, Folder 5]

• Letter from F. E. Bartell to LP RE: Asks LP for information of Dr. Brockway because he interested in hiring him for a position in physical chemistry at the University of Michigan. [LP's response: March 16, 1937] [Next letter from Bartell: March 18, 1937] [Filed under LP Correspondence: Box #31.11, file: (Brockway, Lawrence O.)]
• Letter from LP to Dr. Hugh M. Smallwood RE: in response to Smallwood's letter about the paper on the "adjacent charge rule." LP tries to clarify a few points and take into consideration Smallwood's thoughts. [Smallwood's letter: February 27, 1937] [Filed under: S: Correspondence, Box #377.7]
• Letter from LP to Professor Roger Williams RE: LP reports that he has not succeeded in getting a crystalline pattern from the calcium salt sample. [Filed under: Williams, Roger, J. Box #436.2]
• Note from George Wheland to LP RE: Updates LP on his work and explains that he may have discovered the reason for the discrepancies between the valence bond and the molecular orbital methods. Informs LP that he has just accepted an instructorship in organic chemistry at Chicago for next year. [Filed under: LP Books, Unpb5.9]

• Letter from Gerald Wendt to LP RE: Thanks LP for his close attention to the revision of Lassettre's article. [Filed under C: Organizational Correspondence: Box #70.5, file: Chemical Reviews]

• Letter from John Arthur Wilson to LP RE: Informs LP that the paper sent last week on Valency Rule has been changed in regard to the principles described in his letter. [Filed under W: Correspondence, Box #443.5]

• AHP writes cheque to Ray Huff Studios amount $27.54 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Adohr Milk Farms amount $15.89 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Athenaeum amount $11.15 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Bode's amount $21.89 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Bullocks amount $9.75 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: C. J. Gould amount $16 [Filed under LP Biographical: Box #4.014, Folder #1]
• AHP writes cheque to: Standard Oil Co., of California amount $10.98 [Filed under LP Biographical: Box #4.014, Folder #1]
• Individual Income Tax Return for Calendar Year 1936 [LP Biographical: Business and Financial Box 4.001, Folder 1]
• Letter from Allen D. Bliss, Asst. Editor, Journal of the American Chemical Society to LP RE: Bliss will make some of the punctuation changes requested by LP, but must retain some of the in-house editing style in publishing the paper. [LP's letter to Lamb March 9, 1937; LP's reply to Bliss March 20, 1937] [LP Science Box 14.002, Folder 3]
• Letter from W. A. Noyes to LP, Clark and Lind RE: Noyes informs the Board as to the replies of his second letter regarding successor to Dr. Steiglitz. [Filed under: N: Individual Correspondence, Box #279.3]

• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP recommends that Wilson's paper on predicting the applicability of metaphosphates to tanning not be published. [LP Science Box 14.002, Folder 3]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP requests that the ink cut drawings sent with the manuscript he submitted by E. N. Lassettre be sent back to Pasadena to be redone if the manuscript is to be published. [LP Science Box 14.002, Folder 3]
• Letter from LP to Professor Bartell, University of Michigan, RE: speaks highly of Dr. Brockway in his letter of recommendation for him to begin work in the physical chemistry department at the University of Michigan. [Bartell's letter March 12, 1937] [Filed under LP Correspondence: Box #31.11, file: (Brockway, Lawrence O.)]

• AHP writes cheque to: Hines Grocery Co., amount $2.80 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from LP to Professor R. A. Millikan RE: On Professor's Yost's behalf, LP asks if his railroad and Pullman fare could be paid for by CIT as he heads to Cleveland to speak in a symposium held by the American Chemical Society. [Filed under: Millikan, Robert, Box #247.1]
• Letter from M. D. Hoff, Reinhold Publishing Corporation, to LP RE: Informs LP that he is sending a complimentary copy of their recent publication, "The Chemistry of Natural Products Related to Phenanthrene." [Filed under LP Correspondence: Box #120, Folder #120.1]
• Letter from Noyes to Clark, Lind and LP RE: Noyes discusses several issues concerning the Board and encloses copies of the letters that each Board member has sent to him. [Filed under N: Individual Correspondence, Box #279.3]

• AHP writes cheque to: Edythe's Wave Studio amount $0.75 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from F. E. Bartell to LP RE: he has received his letter concerning Dr. Brockway and is very impressed with what was said. Thus, he will give careful consideration to Brockway for the position. [LP's letter March 16, 1937] [Filed under LP Correspondence: Box #31.11, file: (Brockway, Lawrence O.)]
• Letter from H. I. Schlesinger to LP RE: Informs LP of a bright young man, Mr. Aaron M. Altschul, who is going to get his Doctor's degree in physical chemistry under Professor Hogness this year. Schlesinger felt it worthwhile to write about him and his work in case LP had a place where he may work. [LP's letter: February 24, 1937] [LP's reply: March 22, 1937] [Filed under: S: Individual Correspondence, Box #357.7]
• Letter from Harold C. Urey to LP RE: Asking LP on the suitability of publishing The Polarity of Chemical Bonds, written by Huggins, in the next Publication of the Journal of Chemical Physics. [LP's reply: March 23, 1937] [Filed under: Urey, Harold: Reprints, Correspondence, Box #419.1]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP encloses paper by Paul C. Cross, John Burnham and himself on the Raman spectrum and the structure of liquid. [LP Science Box 14.002, Folder 3]
• Note from H. D. Springall to LP RE: Springall asks LP to please write to Stanford, asking if he would be allowed to use their laboratory for a short time, during his stay in California. [Filed under: S: Individual Correspondence, Box #367.6]

• Letter to LP from Dr. W.T. Astbury RE: Astbury plans to arrange visits with LP while he is in Pasadena and looks forward to their meeting along with others in California. [LP's letter to Astbury March 4, 1937] [Filed under LP Correspondence: Box #6.18, file: (Astbury, William T.)]

• Letter from Charles K. Swartz to LP RE: asking LP if a specific article written by K. Takane and T. Takeuchi on the structure of Cordierite can be found in this country. If so he would like help in locating it. [LP's reply: March 30, 1937] [Filed under: S: Correspondence, Box #377.7]
• Letter from George Glockler to LP RE: Thanks LP for his opinion of Dr. Klug but reports no decisions will be made until after the Spring American Chemical Society meeting. [Filed under: G: Correspondence, Box #136.15]
• Letter from LP to Allen Bliss, Asst. Editor, Journal of the American Chemical Society. [Bliss' letter to LP March 20, 1937] [LP Science Box 14.002, Folder 3]

  March 20, 1937

  Dr. Allen D. Bliss

  Assistant Editor

  Journal of the American Chemical Society

  Chemical Laboratory of Harvard University

  Cambridge, Massachusetts

  Dear Dr. Bliss

  I do not publish many papers in the Journal involving centered lines. Although I do not like the omission of centered line punctuation, I am willing to accept your proposal that it be done in order to have the serial commas retained.

  Yours truly,

  Linus Pauling

  LP:mrl

• Letter from LP to Professor Noyes RE: LP supports the nomination of Professor E. P. Kohler under the conditions state in Noyes' last letter. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter to Dr. Carl L. Alsberg from LP RE: thanks him for the reprints and explains he has done nothing about the gluten project yet. [Letter from Alsberg March 10, 1937] [Filed under LP Correspondence: A: Correspondence, Box #12.3]

• Letter from Gerald Wendt to LP RE: Is interested to know what LP thinks of the enclosed manuscript by Traube and whether or not the material is sufficient for publication. [LP's reply: March 30, 1937] [Filed under C: Organizational Correspondence: Box #70.5, file: Chemical Reviews]
• Letter from LP to Dr. Herbert N. McCoy RE: LP has prepared a reports on the x-ray investigation of McCoy's specimens. LP regrets that the report is not very accurate and offers to discuss this at anytime after next week. [Filed under: M: Correspondence, Box #255.4]
• Letter from LP to Dr. John Arthur Wilson RE: LP was interested to read Wilson's fifth paper on the electronic theory of tanning. [Filed under: W: Correspondence, Box #443.5]
• Letter from LP to Mr. M. D. Hoff RE: Thanks him for sending the copy of their recent publication. [Filed under LP Correspondence: Box #120, Folder #120.1]
• Letter from LP to Professor H. I. Schlesinger RE: LP has not yet made plans regarding appointment of research fellows next year and is unsure whether there will be any openings. Suggests that he have Mr. Aclschul send a brief informal accounts of his training and interests. [Schlesinger's letter: March 18, 1937] [Filed under: S: Individual Correspondence, Box #357.7]
• Letter from LP to Registrar at CIT RE: LP writes that Mr. Henri A. Levy has submitted a written report on the progress of his research and on the basis on this and of his work in the laboratory he has fulfilled the requirements for admission to candidacy for the degree of Doctor of Philosophy. [Filed under: L: Correspondence, Box #230.3]

• Letter from LP to Dr. Maurice L. Huggins. [Filed under: H: Individual Correspondence, Box #162.13]

  March 23, 1937

  Dr. Maurice L. Huggins

  Kodak Park Works

  Eastman Kodak Company

  Rochester, N. Y.

  Dear Maury:

  The arrival yesterday of a letter from Urey asking about your manuscript reminded me of it. It arrived here along with other mail during ay absence on a trip to Berkeley, and since my return I have been busy and have put off doing various things in an inexcusable manner.

  I am glad to hear that your work is starting off well. I am sure that you could have plans of Brockway's electron diffraction apparatus if you want them, although perhaps it would be necessary to have some of them traced, at a small cost. Fred Henson did not build the outfit, which was made in our own astrophysics shops, which are now busy with astrophysics work and could not do outside work anyway. I doubt that there would be any advantage to having Hanson construct the apparatus for you. Moreover, I do not know whether the apparatus would be very satisfactory for work on surfaces and thin films; after seeing the beautiful photographs published by Finch and Quarrell, I think that you would do well to build an outfit like theirs.

  In regard to your paper I have the following comments to make.

  On page 4 you say that there must be more L L resonance in HF than ionic resonance. I doubt that this statement and the following statements based on it are correct; in any case, they need some support. The only calculations I know of which bear on the question are those of Weinbaum and Roson for H₂; these show that the ionic contribution is as great as the contribution of a better function than an L orbital. In HF the ionic contribution would no doubt be still greater in relative importance. I might point out that there is a definitely incorrect statement on this page; an ionic state of a molecule cannot be considered as involving orbital.

  I doubt, for these same reasons, that F_{L K}H_{L L}F structures are important for HF₂- and that the other structures suggested for compounds of first row atoms are of much significance.

  On page 7 you point out that 4 coplanar bonds around a cuprie kernel seem to disagree with my original theory. I did not understand at first that a single electron is not able to hold tenancy of an orbital which can be made useful in bond formation. This is seen to be true, however, inasmuch as an orbital used in bond formation contributes penetration energy of one electron, and there is accordingly no energy loss in transferring the orbital from occupancy by one unshared electron to use in bond formation. There is a loss in penetration energy when an unshared electron pair is promoted; that is, an unshared pair can reserve an orbital but a single unshared electron cannot.

  In general, my feeling is that your idea about the use of higher orbitals such as 4d orbitals for the iron group is a good one, but that you are too extreme in rejecting ionic structures in favor of structures of this type in all cases. For example, it is hard to understand why the 4s4p ²4d square bonds are not formed more often. You may be interested to learn that we have discovered a ferric complex with three unpaired electrons. We also have some evidence from magnetic work on disulfides regarding the use of 4d orbitals.

  Finally, I would like to mention again the "Undergraduate Thesis, 1919" to which you refer twice in this paper. You remember that I inquired for this at the U. C. library and then of you, and finally after you wrote me that it was a term paper in Professor Bray's class, of him, without success. It seems that under these circumstances you should be careful about this reference, and perhaps should refer instead to published papers or existent manuscripts.

  I am sending a copy of this letter to Urey, in answer to his request for my opinion.

  With best regards, I am

  Sincerely yours,

  Linus Pauling

  LP:mrl

• Letter from LP to Mr. T. W. J. Taylor RE: LP thanks Taylor for the copy of his revision of Sidgwick's Organic Chemistry of Nitrogen. Explains that he has revised the double bond radii of atoms, dropping C=C to 1.34 A. [Filed under: T: Individual Correspondence, Box #405.7]
• Letter from LP to Professor Don Yost RE: Explains that Professor Millikan is agreeable with his trip East, but LP suggests that he take the list of expenses to Mr. Barrett so that they can be covered. [Filed under: Y: Individual Correspondence, Box #460.3]
• Letter from LP to Professor Harold C. Urey RE: LP encloses a copy of a letter to Huggins, which expresses in some detail LP's opinion of his manuscript. LP wishes not to make a definite recommendation considering that the work is closely related to his own. [Urey's letter: March 18, 1937] [Filed under: Urey, Harold: Reprints, Correspondence, Box #419.1]
• Letter from LP to Professor N. V. Sidgwick RE: Thanks Sidgwick for sending a copy of his book on the organic chemistry of nitrogen. [LP's next letter: May 1, 1937] [Filed under: Sidgwick, N. V. Box #364.1]
• Letter from LP to Professor Robert A. Millikan RE: LP asks if he would be interested in inviting Dr. Schein to speak but he does not know the nature of his work on cosmic rays is. [Filed under: Millikan, Robert, Box #247.1]

• Letter D. M. Wrinch to LP RE: Thanks LP for his letter and will consider postponing her trip until later in the year or possibly coming to Cornell in fall. [Filed under: W: Individual Correspondence Box #438.12]
• Letter from Arthur B. Lamb, Journal of the American Chemical Society to LP RE: Edwin N. Lassettre's manuscript "The Interpretation of Freezing Point Lowering Data in Terms of Polymerization." [LP Science Box 14.002, Folder 3]

• Letter from George Cady to LP RE: Thanks LP for the reprints. Explains to LP that now that he is an industrial chemist for The Columbia Chemical Division of the Pittsburgh Plate Glass Co. and cannot continue his work with fluorine. [Filed under C: Correspondence, 1921-1957, Box #74.5]
• Letter from Paul C. Cross to LP RE: Sends LP a copy of the paper on the Raman Spectrum of water. Asks him to look it over along with the technical editors. [Filed under C: Individual Correspondence: Box #68.13]

• Letter from Arthur B. Lamb, Journal of the American Chemical Society to LP RE: Requests LP's opinion on a manuscript by Dr. Leighton entitled "The Raman Spectrum and the Structure of Water." [LP Science Box 14.002, Folder 3]
• Letter from Farrington Daniels to LP RE: Asks LP to come to Denver on June 21 through 25 for the American Association for the Advancement of Science. Hopes that LP will join them and be a part of the program by speaking on any subject. [LP's reply: March 30, 1937] [Filed under D: Individual Correspondence: Box #89.4]
• Letter from W. A. Noyes to LP RE: Noyes is very flattered that it is the desire of the Board of Editors of the Scientific Monographs to have him join the Board however, he regrets to say that because of other time commitments he will be unable to accept. [LP's reply: March 30, 1937] [Filed under: N: Individual Correspondence, Box #279.3]

• Enclosed: Letter from Robert A Millikan to the Board of Trustees of The Rockefeller Foundation RE: Requesting grant. [Filed under LP Science: Box #14.037, Folder #37.8]
• Letter from Robert A. Millikan to Warren Weaver, Director of the Natural Sciences, The Rockefeller Foundation RE: Enclosed statement to trustees concerning application for grant to fund researches on biological problems by the methods of organic chemistry and structural chemistry. Enclosed: A Program for the Development of Organic Chemistry at the California Institute and for an Attack on Biological Problems by the Methods of Organic Chemistry and Structural Chemistry. [Filed under LP Science: Box #14.037, Folder #37.8]

• Letter from LP to Miss Little RE: LP asks if it would be possible for Mr. Verner Shomaker to make use of the Athenaeum board and room during the period of July 20 to August 20 instead of June 10 to July 10. [Filed under: Schomaker, Verner, Box #359.1]

• AHP writes cheque to: Ray Huff Studios amount $15.45 [Filed under LP Biographical: Box #4.014, Folder #1]

• AHP writes cheque to: Nellie Durby amount $1.70 [Filed under LP Biographical: Box #4.014, Folder #1]
• Letter from LP to Arthur B. Lamb, Editor, Journal of the American Chemical Society RE: LP strongly recommends that the paper by Cross, Burnham and Leighton on the Raman spectrum and the structure of water be published. [LP Science Box 14.002, Folder 3]
• Letter from LP to Dr. George W. Wheland. [Filed under: LP Books, Unpb5.9]

  Dr. George W. Wheland

  Dyson Perrins Laboratory

  Oxford

  England

  Dear George:

  I am glad to see your chapter on further approximate methods. I have mislaid the list of chapter and section topics which we formulated. If you have a copy I wish you would send me a copy of it; if not, I wish you would send me the list as you remember it. Jack has sent the manuscript of his appendix on numerical methods. As soon as I have gone over it and had it typed I shall send a copy to you for criticism.

  I am interested to learn that you are going to Chicago, and I hope that you find it satisfactory from every point of view. Your position here has been held open, without any inconvenience to us, although we might have been put to some trouble if Brockway had not received his Guggenheim Fellowship. He is excited about that now and is working hard to get his results prepared for publication before August.

  Penney’s treatment seems to me too to be a good one, and Brockway and I are planning to discuss it in our long paper on inter-atomic distances in hydrocarbons. I think it might be wise to retain our curve corrected for the new double bond value, in discussing double bond character, and to use Penney’s curve in connection with a quantity called the order of the bond, the double bond character being of more chemical significance and the order of the bond of more quantum mechanical significance. I haven’t yet seen Lennard-Jones’ paper nor Hückel’s brainstorm.

  The contract was lot a few days ago for the construction of four new buildings, the new chemistry building, second biology building, and two geology buildings, and excavation for the chemistry building is supposed to start this week. We are all looking forward to moving into the new building a year from now, and I especially am anxious to have a chemical laboratory of my own, so that I won’t have to work in the little chemical room in Astrophysics.

  With best regards to Mrs. Wheland, I am

  Sincerely yours,

  Linus Pauling

• Letter from LP to Dr. Gerald Wendt RE: LP does not believe the manuscript by Traube is acceptable for publication in Chemical Reviews. [Wendt's letter March 22, 1937] [Filed under C: Organizational Correspondence: Box #70.5, file Chemical Reviews]
• Letter from LP to Dr. Paul C. Cross RE: LP believes that Cross' manuscript on Raman spectroscopy is satisfactory for publication. [Filed under C: Individual Correspondence: Box #68.13]
• Letter from LP to Professor Charles K. Swartz RE: regrets to say that he does not know where the Journal of the Japanese Association of Mineralogists can be found. [Swartz's letter: March 20, 1937] [Filed under: S: Correspondence, box #377.7]
• Letter from LP to Professor Farrington Daniels RE: LP regrets that he will not be able to attend the meeting of the American Association for the Advancement of Science in Denver. [Daniels' letter: March 26, 1937] [Filed under D: Individual Correspondence: Box #89.4]
• Letter from LP to Professor W. A. Noyes RE: LP casts his vote for Gilman and Fieser, without distinguishing between the two. [Filed under: N: Individual Correspondence, Box #279.3]
• Letter from W. R. Reinhold to Dr. Hibbon RE: On Professor Noyes' behalf, Reinhold has written to discuss the question raised concerning the prices charged for books published in the A. C. A. Monographs Series. [Filed under: N: Individual Correspondence, Box #279.3]
• Note from W. D. Leech to LP RE: Is sorry to learn of Professor Noyes death and apologizes for not writing sooner however he wonders who Noyes' successor will be. Informs LP that he is planning a trip to the States early next year. [Filed under: L: Correspondence, Box #230.3]

• Letter from James H. Hibbon to Mr. Reinhold RE: Discusses with Reinhold several issues concerning the both of them. [Filed under: N: Individual Correspondence, Box #279.3]