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April
  • Catalyst from the Philadelphia, Delaware, South Jersey Sections of the American Chemical Society announcing LP as the April speaker and providing a biographical sketch about him. [LP Scrapbooks 6.003.1]
  • Publication: "The oxygen equilibrium of hemoglobin and its structural interpretation," LP. National Academy of Sciences, 21, pp. 186-191. [LP Publications: 1935p.5]
  • The Chemical Bulletin of the American Chemical Society, April 1935: p.102 addresses LP's talk on "Modern Structural Chemistry" at the Chicago meeting of the A. C. S. [LP Science Box 14.002, Folder 2]

April 2
  • AHP writes cheque to: Polytechnic Elementary School amount $50 [Filed under LP Biographical: Box #4.013, Folder #1]

April 3  (Akron, OH)
  • Letter from N. V. Sidgwick to LP RE: Sidgwick is hoping that LP will be able to come over to the meeting of the British Association at Norwich on September 4. He is making progress towards starting an electron diffractions apparatus but it is slow because they have no Associate Fellows there. He reports that Jenkins has been an extreme disappointment to him and hopes he is working well for LP. [Filed under: Sidgwick, N. V. Box #364.1]
  • Letter from N.V. Sidgwick, Lincoln College, Oxford to LP RE: He hopes that LP will be able to come to the Norwich meeting of the British Association September 4, 1935 to September 11, 1935. Sidgwick is working on starting an electron diffraction apparatus. He asks a question about the distances between atoms in diatomic molecules in the vapours of alkali metals. [LP's reply to Sidgwick May 24, 1935] [Filed under LP Correspondence: Sidgwick, N. V., Box #349]

April 4  (Orrville, OH)
  • Letter from R. Millikan to Sidney Weinbaum RE: Informing Weinbaum that upon the recommendation of Millikan and LP, he has been reappointed a Research Fellow in Chemistry with a salary of $1200 beginning July 1, 1935. [LP Science Box 14.037, Folder 7]

April 8  (Boston, MA)
  • LP and L. E. Sutton. A Wave-Mechanical Treatment of the Mills-Nixon Effect. Transactions of the Faraday Society 31 (171): 186-192. Received for publication April 8, 1935; published August 1935. [Filed under LP Publications: Box 1935p, Folder 1935p.1]

April 10  (Boston, MA)
  • AHP writes cheque to: Lola Labadie amount $15 [Filed under LP Biographical: Box #4.013, Folder #1]

April 12  (Boston, MA)
  • AHP writes cheque to: F. C. Nash Company amount $13.42 [Filed under LP Biographical: Box #4.013, Folder #1]
  • AHP writes cheque to: Lola Labadie amount $20 [Filed under LP Biographical: Box #4.013, Folder #1]
  • AHP writes cheque to: T. W. Mather Company amount $5 [Filed under LP Biographical: Box #4.013, Folder #1]
  • AHP writes cheque to: William D. Crane amount $85 [Filed under LP Biographical: Box #4.013, Folder #1]

April 15  (Boston, MA)
  • Letter from LP to the Executive Council, C. I. T. RE: LP recommends appointments to be made from the Rockefeller and Molecule-structure Funds, respectively. [LP Science Box 14.037, Folder 7]

April 19  (Princeton, NJ)
  • Letter from Arthur A. Noyes to LP, National Academy of Sciences, RE: Tells LP that he received a letter from AHP and that Roscoe showed him LP's recent letter to him. Informs LP that the appointments of the men on the Rockefeller Fund were made by the Executive Council and notices were sent out. Lets LP know that they are offering free tuition to Taylor since Clarke declined it. Asks LP to find out who has been appointed National Research Fellows from CIT and if Harker and Bonner got their appointments. [Letter from LP to Noyes, 4-23-1935] [Filed under LP Personal Safe: Drawer 2, Folder 2.018.8]

April 22  (Washington, DC)
  • Letter from Francis W. Sears, MIT to LP RE: Encloses curves for Br2 and C2H3Cl films. [LP's letter to Sears January 29, 1935] [Filed under S: Individual Correspondence, Box #361.3]

April 23  (Washington, DC)
  • Letter from LP to Professor A.A. Noyes, RE: Informs Noyes that Fervel, Helmhols, and Lyman G. Bonner have been appointed to National Research Fellowships, but that Harker was not because of his age. Lists those who were appointed to work in the Physics Department. Discusses Mirsky's arrangements to work in Pasadena for 15 months. [Letter from Noyes to LP, 4-19-1935] [Filed under LP Personal Safe: Drawer 2, Folder 2.018.8a]

April 26
  • LP writes cheque to: Dr. Paul H. Emmett amount $25 [Filed under LP Biographical: Box #4.013, Folder #1]

April 28  (Washington, DC; transit to Atlanta, GA)
  • LP writes cheque to: Paul H. Emmett amount $28 [Filed under LP Biographical: Box #4.013, Folder #1]

April 29  (Atlanta, GA)
  • Letter from James S. Thompson, VP McGraw-Hill Book Company, to LP, RE: Thompson says he has LP's letter of the twenty-sixth and that depending on how long it takes the proofs to come back, they should have no trouble publishing by mid-summer. [Filed under LP Safe Contents, Drawer 3, Folder 3.005.36]