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 Jonathan Mason to William Tudor,

Two letters on topics such as Mason’s search for original documents relating to the Constitution and the admission of Missouri to the union as a slave state.

Thaddeus Mason Harris' working documents regarding subject-based library catalog, ca. 1790

Thaddeus Mason Harris, who served as interim librarian of the Harvard College Library in 1787 and as its librarian from 1791 through 1793, is believed to have created these notes while helping compile the library's first printed subject-based catalog. The catalog, Catalogus Bibliothecae Harvardianae Cantabrigiae Nov-Anglorum, was published in 1790 and represented a significant change in approach to the cataloging of the library's collections, which had formerly been cataloged alphabetically. These documents, many of them on small scraps of paper, contain the titles and bibliographic information of books on a range of topics, from "Anatomici" to "Rhetorica."

Mason Hall, 1861

Album title: University of Michigan. Class of 1861. On tltle page: Photographed by T.D. Tooker, Ann Arbor, Mich.

Plaque for Old Mason Hall

Plaque given by the Sarah Caswell Angell chapter of the Daughters of the American Revolution to commemorate Mason Hall. The first University building devoted to instruction, the building was known as the University Building upon completion in 1841. It was both dormitory and classroom facility. It was named after Govenor Stevens T. Mason in 1843. In 1856 the central part of the North Wing was renovated to house the University Library and Museum. A similar building was erected to the South. University Hall (built 1871-1873) connected the two buildings, which then were referred to as South Wing and North Wing. Mason Hall, South Wing and University Hall were removed in 1950.