70 PROCEEDINGS OF THE AMERICAN ACADEMY 



was three degrees. The place given is derived from a single pas- 

 sage over the annular micrometer, and is therefore liable to some 

 uncertainty ; it however agreed nearly with the result from instru- 

 mental readings. 



" The following elements have been computed from the observa- 

 tions given above. By Professor Peirce, from the observations on 

 March 4th, 5th, and 6th. 



1847, Per. passage, March 3r\907, Greenwich M. S. T. 

 " distance, 0.04444. 



Long, of ascending node, 10° 13'. 

 " perihelion, 256 33. 

 Inclination, 48 53. 



Motion direct. 

 " By G. P Bond, from places of March 5th, 12th, and 19th, account 

 being taken of the small corrections. 



1847, Per. passage, March 30'\3369, Greenwich M. S. T. 

 « distance, 0.0445986. 



Long, of ascending node, 21° 06' 46". 



" perihelion, 275 16 22. 

 Inclination, 48 41 49. 



Motion direct. 

 " The places computed from the latter orbit require the following 

 corrections. 



March 5th, Obs'd — Comp. Long, = + ^.2 Obs'd — Comp. Lat. = + 0.5. 

 12th, " « = — 3.6 " " = — 44.5. 



19th, " » = — 0.3 " " =— 0.7." 



Mr. William C Bond communicated a second series of 

 moon culminations observed at the Cambridge Observatory. 



" The observations now presented to the Academy were made at 

 the first station occupied as an Observatory in Cambridge. Lat. 42° 

 22' 22". Long. 4''- 44"'- 30'-. The Transit Instrument has an object- 

 glass of 2f inches aperture, and 46 inches focus. The clock error 

 has been determined solely by means of the standard stars of the 

 Nautical Almanac. The southern meridian mark of this station is 

 situated on Blue Hill, in Canton ; it is placed on a massive and con- 

 spicuous stone tower, erected for the purpose, 58,520 feet south of the 

 transit instrument, and within a short distance of one of the principal 

 stations of the State and United States Surveys. 



