MEMOIRS 
OF THE 
AMERICAN ACADEMY. 
IV. 
The Latitude of the Cambridge Observatory, in Massachusetts, 
determined, from Transits of Stars over the Prime Vertical observed 
during the Months of December, 1844, and January, 1845, by 
WILLIAM C. BOND, A. A.S., 
DIRECTOR OF THE CAMBRIDGE OBSERVATORY, 
MAJOR JAMES D. GRAHAM, A. A.S., 
OF THE UNITED STATES CORPS OF TOPOGRAPHICAL ENGINEERS, 
AND 
GEORGE P. BOND, 
OF THE SENIOR CLASS IN HARVARD UNIVERSITY. 
By BENJAMIN PEIRCE, A. A.S., 
PERKINS PROFESSOR OF ASTRONOMY AND MATHEMATICS IN HARVARD UNIVERSITY. 
Tue latitude of Harvard Hall in Cambridge was determined by 
Professor Williams, in the years 1782 and 1783. His observa- 
tions were made upon meridian altitudes of the sun, and of north 
and south stars, including the pole star, with a Sisson’s quadrant 
