* 
Astronomy and Meteorology. 145 
The following table shows the relative brightness of this comet for 
several dates during the period of its visibility, computed on the suppo- 
sition that this brightness varies as za i Where R and r represent the 
distances of the comet from the earth and sun. 
Date. Brightness, Date, | Brightness. Date. Brightness. 
Oct. 24 031 an. 21 24 Feb, 21 361 
Nov. 15 0°45 Jan 13:04 ] 1°63 
Dec, 1 059 Feb. 1 18:88 March 11 O18 
Dec. 15 0°83 Feb, 4 20:07 March 21 0-45 
Jan, 1 1°64 Feb, 17°98 Apri 0-29 
Jan. 11 3°06 Feb. 11 12°88 April 1 0-22 
W the western coast of the United States, by Lieut. J. M. Gilliss. 
M e have recently received, through Prof. Bache, Superintendent of the 
» U.S. Coast Survey, a fuller report of these expeditions, from which we 
1) Expedition to Labradeti 
te itude of the place of observation was 59° 47’ 49” N. and lon- 
Situde 4h 1gm 539s W. of Greenwich. Its elevation above the level of 
Sea was 110 feet. 
Beginning of the eclipse. 
Time. ryer. Color of screen. 
8h 8m 59-9 Alexander. Green. 
“ sdb Compound 
6 {) 
12 Poca ; Barnard. { Red and green. 
16-1 Smith. Neutral. 
16°6 Venable. Green. 
Beginning of total obscuration. 
te E Bare eye. 
ee a No 
33-6 Ashe No screen. 
33°6 Murray. No screen. 
- End of total obscuration. 
916 su-4 wis No screen. 
31-6 Alexander. No sereen. 
Ax. Jour. Sci.—Srconp Sams, Vor. XXXII, No. 97.—Jan., 1862. 
19 
