E. & Holden— Proper Motion of the Prifid Nebula M. 20. 448 
6 and 11, the ) maendepi of Lassell’s figure are most nearly pos 
sented. As before describe d, the nebulosity between 5 and 26 
mostly faint, bata near 26 it becomes brighter, so that 26 is aacobved 
now more dee eply in the brighter parts of (A) than is given by 
Lassell, and not so much as given by Trouvelot. 
The ‘nebulosity immediately about 4, 27, 28 is faint. The dark 
channel y a to have well marked edges south of 5. The faint 
nebulosity about 5, however, does not seem to be connected (as in 
Lassell’s figure) with (B). 
August 3, 
Night very Baie i A sep 14 46) = -—211"'37 (2), —0"°30 re- 
fraction, Jd = — 7 (2). _Lassell gives Soden , and I pre- 
sume there is an error in ae numbering her 
Order of brightness of the see stars. 
1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 18, 14, 18, 20, 26, 21,25. 39 and 24 
are quite faint.’ Lassell’s order of brightness is therefore main- 
tained. Nebulosity was traced north following Sh. 379 a consid- 
erable way, about half a degree to a nebulous star 8", but I was 
hindered in this by clouds which finally covered the whole sky. 
The same hindrance occurred in the same way on the clear night 
of July 31. The connection of this nebula with neighboring ones 
deserves examination, as it is vat extended, but no opportunity 
offered ——o 1877 for this work : 
ith regard to t po triple star: It was first seen double b 
ee South ie Say ane aoe wit 
in 1877. A = Lassell 1; = 3; r= 
The approximate oes me the various  soimponents are; 
A and B : o11° : 10” rg 
A and C Swe & 65 t Bh. ay 
B and D : 283 : 2°5 
A and F ; 107 : 19°5 
B and E ‘ 193 5°8 
This nomenclature includes Trouvelot’s star s.f.1. Ihave several 
times sus eee the existence of a small star n. p. A. =310 
s=6" r measures of the above stars, see the Washington Aiea. 
n nd rve th 
triple star Sh. 379 on the iraneit-Cirole, in order to fix its position 
b solutely. 
The ington observations of star positions are given in the 
table following It will be noticed that in the column “ Holden— 
Mason” the errors are usually within the limits set by Mason 
himself. 
