AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES.] 
ART. rene the Proper Motion o the oe rod 
M. 20 = H. v; 10, 11,12 = h. 1991, 8718 = G. C. 4355. 
[R. A. = 17h 53m 518-8, N. P. D. = 113° 1/ 39-9; 1860- - 
by Epwarp 8. HoLpEn. 
[Read in Abstract to the American Association for the Advancement of Science.] 
It seems proper to collect the evidence now existing on this 
point in order to show the desirability of the study of this 
nebula, and because, in case the indications which we there find 
of a decided proper motion should be confirmed, such results 
would be of importance. 
Following I give in chronological order such extracts from 
published and unpublished observations of this nebula as bear 
on the points now under consideration, italicizing such portions 
as deserve particular attention. 
OBSERVATIONS OF THE NEBULA. 
This nebula was discovered by Messizr June 5, 1764, but he 
gives no details concerning it.—Hist. de l’ Aca ” des Sciences 
1771, p. 443 
Am. Jour. Rok cPane ~~ Vou. XIV, No. 84.—Dec., 1877. 
