Mathematics notes, examples, and exercises. According to the title page, Green's teacher was Phineas Cary, of Concord Township, Delaware County. Topics include mathematics for commerce or accounting, such as simple interest, discount, barter, loss and gain, decimals, currency; measures of weight, land, and liquid; and proportions. A later title page (f. 65r) reads, "William Green's practical arithmetic collected from one of the latest authors in the winter of 1805 and 1806 with Warrick Miller," followed by more notes on similar topics as well as notes on square and cube roots and arithmetical and geometrical progressions. Many pages are signed and dated by William Green, but the end of the book (beginning ff. 102v-103r) is dated 1830 and continued by J.C. Green. 6 loose items laid in the back, consisting of a detached page, a compass rose in watercolor, 2 additional word problems, a printed strip of three pictures, and a motto.
