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October
  • LP Research Notebooks, RNB 02: Notes and X-ray diffraction data–Eglestonite. [Filed under LP Research Notebooks: Research Notebook 2: 140-141]

October 4
  • AHP writes cheque to: Model Grocery Co. amount $1 [Filed under LP Biographical: Box #4.011, Folder #3]
  • Withdrawal receipt for LP amount $50 [Filed under LP Biographical: Box #4.011, Folder #3]

October 5
  • Handwritten note from F.J. Allen, Purdue University Department of Chemistry, to LP, RE: Informs LP that he mailed him a tube on Xenon, which is designed to be sealed to his apparatus with a piece of iron in it, which can be used to crack the inner lip against a coil magnet. Apologizes for not sending this sooner. [Filed under LP Personal Safe: Drawer 3, Folder 3.018.3]
  • Memorandum cheque notifying LP of monthly transfer of $50 among accounts [Filed under LP Biographical: Box #4.011, Folder #3]

October 7
  • AHP writes cheque to: Athenaeum amount $9.30 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Dutch Drive-In Meat Market amount $17.65 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Edward S. Curtis Studios Inc. amount $27.50 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Golden State Dairy amount $16.44 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Sanitary Laundry amount $5.31 [Filed under LP Biographical: Box #4.011, Folder #3]
  • LP Research Notebooks, RNB 07 RE: Proton waves diffracted by gas molecules. [Filed under LP Research Notebooks: Research Notebook 7: 264-265]

October 11
  • AHP writes cheque to: F. N. Chamberlain amount $20.96 [Filed under LP Biographical: Box #4.011, Folder #3]
  • Note from LP to Dr. Ketelaar, Universiteit Amsterdam RE: States that there were typographical errors in his paper because it was not readied for publication until a year after the research was completed. Informs Ketelaar of the correct equation. Thanks him for the reprint. Will send Ketelaar some reprints of his article under separate cover. [Note from Ketelaar to LP 7-6-3[?]] [Filed under LP Personal Safe: Drawer 3, Folder 3.018.120]

October 12

October 16
  • Letter from Albert Sprague Coolidge to LP, RE: Informs LP that he and Mr. James, who worked together to compute the molecular energies of water and bichloride using the Heitler and London method applied to hydrogenic atomic wave-functions, have decided that these computations aren't going to get them far until they find better wave functions. Explains that they would like to work with the method used by Hylleraas to allow the mutual electronic repulsion in helium. Asks if LP is already doing work along these lines. Notes that they would be glad to receive reprints of LP's papers. Handwritten note by LP: "Ansd." [Filed under LP Personal Safe: Drawer 3, Folder 3.018.34]

October 17
  • AHP writes cheque to: City of Pasadena amount $12.85 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Dr. Herbert A. Whipple amount $38 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Hancock Music Company amount $12 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Los Angeles Gas and Electric Corporation amount $11.24 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: Pasadena Star-News amount $1.95 [Filed under LP Biographical: Box #4.011, Folder #3]
  • AHP writes cheque to: T. W. Mather Co. amount $10.84 [Filed under LP Biographical: Box #4.011, Folder #3]

October 18
  • AHP writes cheque to: Elizabeth Page amount $20 [Filed under LP Biographical: Box #4.011, Folder #3]

October 24
  • Notes: Close Packing Structures [LP Biographical: Academia Box 1.010, Folder 8]

October 29
  • AHP writes cheque to: Elizabeth Page amount $20 [Filed under LP Biographical: Box #4.011, Folder #3]
  • LP writes cheque to: cash amount $50 [Filed under LP Biographical: Box #4.011, Folder #3]

October 31
  • Memorandum cheque notifying LP of $50 transfer among accounts [Filed under LP Biographical: Box #4.011, Folder #3]