a Resisting Medium in Space. 407 
been very carefully determined by Professor Axel Moéller of 
Lund, Sweden. A i 
eee area 
culty in the telescope of the Naval Observatory, but on the 
} first night it was looked for it was seen exactly in the predicted 
| Place. Professor Peters of Hamilton College, who is provided 
a Aa = 105-55, Ad = +9'"9, 
F The prediction, therefore, was one of the most accurate ever 
_ Made of the return of a comet. Hence in the case of Faye’s 
detected in his own work, is such that there is additional reason 
ts orbit is that by Professor Oppolzer of Vienna. As the per- 
turbations of thin comet have not been large, regard was hs 
to the first powers only of the disturbing forces, and the calcula- 
fions have been made with comparative ease. By combining 
Am. Jour. Scr.—Turp Series, VoL. II, No. 12.—Dec., 1871. 
26 
