The "Commencement Book" is a small, early-19th century record book that all recipients of Trinity degrees touch during Commencement ceremonies. According to legend, the Commencement Book is used as the result of a mix-up. College President Thomas Church Brownell intended to use a Bible in the first commencement ceremony in 1827, but either couldn't find one or realized he didn't have it with him, and so used his personal record book instead. The book is inscribed with Latin prayers and commencement ceremony exercises dating from 1849, as well as signatures from college president inaugurations.
Trinity College, "Trinity College Commencement Book" (1827). Archival Materials and Documents Collections. 9.