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Manuscript notebook, [1764], containing an introductory section on philosophy and three sections on logic, the third being unfinished. Two engravings, printed in France, are inserted in the text, and the manuscript is probably French in origin. The partly obliterated date of 1764 occurs at the end of section 3.

Papers of Augustus De Morgan including letters and notebooks relating to various mathematical subjects and general correspondence 1864-1867.

1-4. Letters to Augustus de Morgan, mostly about mathematical books and the history of the signs + and -.

1. John Bellingham Inglis, 15 Sep 1864
   2-4. John Thomas Graves, 20 and 27 Sep and 8 Oct 1864
   5-7. Items concerning John Dawson of Sedbergh
   5. Thomas Harrison, 18 Apr 1867
   6. Edward Cust, 9 Sep 1867
   7. Short biography of John Dawson, manuscript copy of article in the 'Kendal Times', 24 Nov 1866
   8. MS notes by Augustus de Morgan, mostly concerned with mathematical books and the first use of the signs + and -.

Together with 14 request slips for books in the British Museum, one dated 1854 and the rest 1864.