E. &. Holden— Observations of Comet b, 1881. 263 
Figure 9; July 13, 9" 30™ m. t. 
Figure 10; July 14, 10" 20" m. t.—Moonlight. 
Figure 11; July 17, 10" 45™ m. t. 
Figure 12; July 18, 9° 30-11" 0" m, t.—The nucleus is double 
(it has not been Previously), p==276", ei 5, with a dark space 
between the par 
July 19; 9 45™ m. t, —Appearances same as last night, but 
fainter. “The nucleus is pies aE in px=280°+. The second 
nucleus is in p=270° s=1” 
July 24; 9" 35™ m Lo nucleus is double, pmaae (4) 
8=2"62 (3). The diameter of the principal nucleus in p=135°, 
68 2). 
The micrometer measures by Mr. Bu ee 
July 26; 9" 3" m.t. The nucleus is rou 
July 27 ; 10" 10™ m. t.—The sees seems elongated in 
p=250°, but I am not sure. 
After this date the comet was examined on several ahs 
Without finding any peculiarity worthy of mention. It is 
noted that there i is no doubt whatever as to the fact ‘hat "ehe 
nucleus was double on July 18, July 19 and July 24. I am 
almost equally positive that it was not double on the other 
ates specified. 
It appears to me that these observations are of interest in con- 
nection with those of Prof. O. Stone at the Cincinnati Observa- 
tory, and of Mr. ee at the Harvard College Observatory. 
Washburn Observatory, Madison, Wisconsin, August 25, 1881. 
Am. Jour. Scr. —Tarap Provan Vou. XXII, No. 130.—Ocrossr, 1881. 
