E. S. Holden—Proper Motion of the Trifid Nebula M.20. 441 
1877. July 2. 
The following stars were identified and placed on the chart: 
1, 2, 3, 4, 5, 6, 7, —, 9, 10, 11, 12, 18, 14, 15, 16, 17, 20, 21, 22, 23, 
24, 25, 26, rd 28, 29, 30, 3], $e 33, 34, 35, 36, a7, 38, 39, 40, 41, 
—,—, 48, 49, 0. 51, 52, —, BA, 5 ; leaving stars 
8, 12, 43, “6, 47, 53 to be aieiantee charted. 
Measures of P, Ao, ete. See Table II. WNotes.—48 has a ne 
less 46 than 18. 44 has a little greater 4d than 18. The 
1 and 12, 19°-2, is nearly that of 1 and 19. If anything the p of 1 
and 19 is greater than oo id 1 ae 12 
12, 
Measures of p, Ja, ete. ‘See Table II. Notes.—The line 12-13 
passes west of 1, and ‘the nebulosity near 1 is still west of this line. 
Star 3 is east of the line 12-13 by about 1” (est.). The line 1-18 
bisects A (roughly speaking). 7 precedes 5 a little. 
Along the line 14-20 there is nebulosity to the edge of y, then 
darkness to the edge of A, then nebulosity to the edge of A again, 
then darkness in /. That is, the preceding edge of A is cut off 
by the line 14-20 
The nebulosity of A just following the line 14-20 is fainter for 3”-6” 
(est.); but beyond this sa it is uniformly bright up to 1, 2, 19. 
877. July 13. 
The line 14-20 is Pare gi in regard to the nebulosity as in figure 
[omitted]; that is, the line 14-20 really passes through the nebula 
near 1, 2, 19, but through a fainter part. It is, however, about 
tangent to nebulosity of the same brightness as that near 1-2 on 
ebula ity i t, 
meturaehs had prides about ray stars since Mason’s faving 
877. 'y 16 
Measures of p and Ja. See Table IL. I suspect D to be vari- 
able, 11 very faint. 
1877. July 25. 
Measures of Ja, 46. See Table II. DandE seen. D is fi 
brighter than any other of the small components of Sh. 379, of quia 
aly D and E are visible whi ene E is quite faint. E<20 
. July 26, 
ae nlight. Placing ve Bae ometer wire through 12-13 the 
wire runs west of 1, 2, 19, but is involved in fainter nebulosity near 
them. Half way from this wire to star 1 Te noes mee becomes 
