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April 1  (Berkeley, CA)
  • AHP writes cheque to: A. C. Vroman amount $0.60 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Barker Brothers Inc. amount $46 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: City of Pasadena amount $3.48 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: City of Pasadena amount $3.50 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Dr. Harvey J. Forbes amount $115 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Encyclopedia Britannica amount $16.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: General Contract Purchase Corporation amount $23.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Los Angeles Gas and Electric Company amount $1.89 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Mattie E. Kerr amount $21.10 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Sigrid Ward amount $1.25 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Southern California amount $2.90 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: T. W. Mather amount $13.25 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: The May Company amount $10 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: William D. Crane amount $100 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Manuscript: Bonds Involving d Eigenfunctions, Fourth Lecture, Berkeley Lectures -- The Nature of the Chemical Bond, University of California, Berkeley, April 1, 1931. [LP Science Box 2.002, Folder 3/LP Speeches 1931s.4]

April 3  (Berkeley, CA)

April 4  (Berkeley, CA)
  • AHP writes cheque to: Athenaeum amount $1.50 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: MacMarr Stores, Inc. amount $10 [Filed under LP Biographical: Box #4.011, Folder #2]

April 5  (Berkeley, CA)

April 6  (Berkeley, CA)

April 7  (Berkeley, CA)

April 8  (Berkeley, CA)
  • Manuscript: The Hydrogen Halides, Seventh Lecture, Berkeley Lectures -- The Nature of the Chemical Bond, University of California, Berkeley, April 8, 1931. [LP Science Box 2.002, Folder 3/LP Speeches 1931s.7]

April 9  (Berkeley, CA)

April 10  (Berkeley, CA)

April 11  (Berkeley, CA)

April 12  (Berkeley, CA)

April 13  (Berkeley, CA)

April 14  (Berkeley, CA)

April 15  (Berkeley, CA)

April 16  (Berkeley, CA)

April 17  (Berkeley, CA)
  • Manuscript: The Three-electron Bond, Eleventh Lecture, Berkeley Lectures -- The Nature of the Chemical Bond, University of California, Berkeley, April 17, 1931. [LP Science Box 2.002, Folder 3/LP Speeches 1931s.11]

April 19
  • Manuscript Notes: "Potential Functions for Electron-pair Bonds" (Pasadena); 10 pages of handwritten notes and calculations [LP Science Box 3.003, Folder 5]

April 20
  • LP writes cheque to: Albert P. Meub amount $12.40 [Filed under LP Biographical: Box #4.011, Folder #2]
  • LP writes cheque to: Cash amount $50 [Filed under LP Biographical: Box #4.011, Folder #2]
  • LP writes cheque to: Myself only amount $202.23 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Letter from LP to Professor Robert E. Swain, Stanford University, RE: Says that he cannot accept the offer of the professorship of physical chemistry at Stanford University. [Letter from Swain to LP, April 14, 191931] [Filed under LP Personal Safe: Drawer 2, Folder 2.003.34]

April 21

April 22
  • LP writes cheque to: California Institute of Technology amount $2.10 [Filed under LP Biographical: Box #4.011, Folder #2]

April 23
  • Letter from Raymond T. Birge, UC Berkeley to LP RE: Birge would like to use LP's idea that the upper doublet sigma level is ionic bonding in CN in his article, but would like LP to publish it himself first or at the same time. [Birge's last letter to LP April 22, 1931] [Filed under LP Correspondence: Box #27.18]

April 24
  • Letter from Jim Goudsmit, University of Michigan to LP RE: Goudsmit apologizes for not writing sooner however, explains various things that have put in a bad mood lately and vents to LP about them. [Filed under: LP Books, 1930b.5]

April 27
  • Letter from LP to Sam Goudsmit. RE: Is sorry that he is discouraged. Asks if he would like to split the royalties for the reprint 50-50. Discusses the new edition. Encloses some pictures. Advises him that if he is going to stay in America he should settle down, have a family, and be American. [Filed under LP Correspondence: G: Individual Correspondence, Box #137.4]

April 28
  • Letter from LP to Dr. Henri Brassuer, RE: Informs Brasseur that the period from September- 12 31st would be satisfactory for him to work at CIT, discusses the type of x-ray equipment they have, and asks if he recommends the purchase of a particular instrument. [Letter from Brasseur to LP April 9, 1931] [Filed under LP Personal Safe: Drawer 3, Folder 3.018.29]
  • Letter from LP to Perrin C. Galpin, RE: LP says he would be pleased to have Dr. Henri Brasseur carry on with the work he has proposed. The suggested period of work is also acceptable to him. [Filed under LP Safe Contents: Drawer 3, Folder 3.018.30]
  • Letter from LP to Sam Goudsmit. RE: Is pleased with the remark Sam made about him in the footnote. Informs him that the time they spend in Copenhagen was the happiest of his life. Hasn't read his paper yet. [Filed under LP Correspondence: G: Individual Correspondence, Box #137.4]

April 29
  • AHP writes cheque to: Martin Casey amount $5 [Filed under LP Biographical: Box #4.011, Folder #2]
  • AHP writes cheque to: Mrs. M. M. Fillmore amount $10.30 [Filed under LP Biographical: Box #4.011, Folder #2]
  • Letter from LP to Sam Goudsmit. RE: Informs him that White has drawn about twenty figures. Asks how the reprinting is coming along. Would like to help prepare the new edition. Asks if Sam has read his latest paper. Asks about his summer plans. Informs him that he has refused an offer to work at Stanford. [Filed under LP Correspondence: G: Individual Correspondence, Box #137.4]

April 30
  • LP writes cheque to: Richard Morgan amount $50 [Filed under LP Biographical: Box #4.011, Folder #2]