442 EH. 8. Holden—Proper Motion of the Trifid Nebula M. 20. 
1877. 
V. The line 3-35 is sag 32 ona cecal to the line 12-13, = 
intersects the nebulosity A near 1,2,19. This line is tangent v 
exactly to the preceding an of the brighter nebula about kan 
three stars. 
An ee of position of #, passing through 20 and 16 (not 9), 
162°°7 
New dark channel between 1 and 10, as in sketch. It extends 
no further east than 10, and 10 and 11 are on or near its following 
borders. Its preceding border is 20’-30" following 1, 2,19. The 
seeing is poor, and this point should be reéxamined. 
The brightest part of the nebula is about the triple star. 
It is an oval mass nearly symmetrically disposed about the triple 
star. The triple star is, if anything, toward its western side. 
(B) The next brightest nebulosity is near 36, but eae Pe not 
much brighter than (C) or the brightest parts of (B) ne 
(D) Stars 12-13 are both inside the ne aie esi [See Oneeye. 
tions of 1875, Aug. 4; 1877, July 12 
E) Star 11 is on the very edge of a ‘irighter portion, but follow 
the Pace Ga by 4 the distance 6 to 11. [See Observations of 
ar 
OF Star a is within the brighter nebulosity, the boundary line 
of which runs (see sketch) [omitted] between 5 and 26, but much 
nearer 26 than 5; perhaps 4 of the distance 26 to 5 
(G) [Star 6 is seekality inside the nebulosity, about half way 
from the shes | edge of the fainter nebulosity to ine preceding 
edge of the brighter.] See Observations of 1875, . 
tars 5, 27 and 28 are on the precedin g edge of ‘the fainter 
parts of A. [But preceding 5, 7, 28 it is not totally black. | 
(J) The triangle 40, 44, 21 has no nebulosity gs is’ at all 
bright within it exce t Al 
(K) 21 is involved in C a few seconds, but it is ius to its north 
edge. 35 is well chs goa 36, 37, 38 are correct on the map. 
1877. July 31.. 
21 and 1, —65"°73 (3), —0”-09 refraction, 46 = —65"°82. 
This is about the mean of the 46’s of 38 and 37. Sketch of stars, 
etc., age 5, 17, 28. 
‘he tmosphere on this night was more favorable than pre- 
viously ‘auting the year, and the principal work was devoted to 
the examination bo the apparent differences between Lassell’s and 
Trouvelot’s fi 
5, etc. is in the northern part of t , and the eye ae 
ors to trace the following “om of i "channel y, that it 1s 
n mpression that 5 on or the preceding 
Plac ing'5 in ne center of the field, and thus prouilig ¢ the dis- 
turbing effect of the well marked border of the channel y near 
