Mathematical notebook attributed to Thaddeus Mason Harris, ca. 1787

Hardcover notebook containing handwritten transcriptions of rules, cases, and examples from 18th century mathematical texts. The author and purpose of the volume is unclear, though it has been connected with Thaddeus Mason Harris (Harvard AB 1787). Most of the entries include questions and related answers, suggesting the notebook was used as a manuscript textbook and workbook. The extracts appear to be copied from John Dean's " Practical arithmetic" (published in 1756 and 1761), Daniel Fenning's "The young algebraist's companion" (published in multiple editions beginning in 1750), and Martin Clare's "Youth's introduction to trade and business" (extracts first included in 1748 edition).

Letters from Thomas Handasyd Perkins to William Tudor,

Three letters written to Tudor in Peru. Perkins responds to Tudor’s reports on the prospects of trade in South America and reflects on other issues relating to trade. He also relays details of Lafayette’s visit to America and the public’s reception. One letter discusses Spanish pressure on the United States relating to the war and responds to Tudor’s letters regarding the General Carrington. He also comments on the election at home: "Adams will probably be president."

Letters from Michael Hogan to William Tudor,

Four letters discussing news of friends and domestic politics and the presidential election, in addition to trade and purchases of certain goods.