Observations of Nebule and Clusters of Stars. 131 
| G. C, | h. & H. | —— 
1878, Apr. 25. Flatness and sharp definition of f side of Nucl n very decided. 
Elbow unmistakeable. Outer convol. and the arm from n seem to be one con- 
tinuous branch though joined by a branch to inner convol. 
[From his measures made in the years 1872-74 Dr. Copeland has calculated 
the following final results. The position angles have been reduced to 1851 
(Corr.=-+ 4'-0), and are very reliable, the distances are poor. 
N n Pos. 15°10' Dist. 260"-3 
N 2 46 28 281-5 
N 4 108 38 241-0 
NGS 162 13 97-2 
N 6 189 0 245°5 
N 7 210 36 170-0 
N 10 218 49 125-7 
N 8 223 0 203°9 
N 17 228 9 114-1 
NG 230 16 84:0 
N 13 275 59 229-7 
N ll 277 47 112-0 
N 14 304 49 236°9 
N 15 308 12 182°3 
The lithograph of M 51 (PL. IV.) is a reproduction of a drawing made by 
Mr. Hunter in the year 1864. It represents perhaps too strongly the re- 
solvability of the brighter parts, but when held at a distance of about 
9 fect from the eye it gives a very good idea of the appearance of this object 
with an average speculum and on a tolerably good night. The diagram is 
roughly copied from two drawings by Dr. Copeland, made on April 12 and 
May 8, 1872.] 
BTS 1625= | 1868, Apr. 23. Ens, dark lane np sf onn side of Nucl. Suspect a spiral branch 
IV. 63 on np side extending toa * sp. 2st sf, is the f of the 2nebulous? (I. obs.) 
3576 IT. 689 | 1874, Feb. 21. cB, pS, R, psmbM, 4 st near, the f * is by far the faintest 
(15m). * 104m Pos. 278°-9, Dist. 447-4. (I. obs.) 
3581 1626= | 1855, Apr. 19. An oval neb, bM, with a * np. 
III. 643 | 1856, May 3. A'S, p Bneb, has Nucl, edges very indistinct, so that I cannot } 
well make out its shape, but I think it is E towards the *. About 5’ nf is 
a v F nebulous knot. 
1861, Mar. 17. I think the * is not inv. The neb is vF with a * or Nucl. in 
centre. (IIT. obs.) 
3595 |1637= )| 1854, May 1. [1638] is F, S, near 2 st, 1643 is pL, F, R, IbM. 
IIT. 86 | | 1856, May 3. 1637 is E nearly pf, bM, 1638 is 
3596 | 1638= | S,R,bM. 1643 is the largest and is p B, 
IIL. 85 | R, gbMN, around which I suspect dark 
3602 | 1643=— | spaces. [About this group see Suppl. to the | 
HUE, Se) G.C., p. 396. ] | 
1877, Apr. 5. Nova [ =6249] ise F, pS, Pos. 
20°-7, Dist. 342" from 1637. 1637 and 
1638 are both E, 1637 most, Pos. 178°2, 
Dist. 324’-1, a F * almost exactly between 
them; 1638 has a v F * 2’ sp. About 
10’ sff 1638 is 1643. F, pL, irr, diffused. 
(III. obs.) 
3600 1641— | 1874, Mar. 22. v F, pS, R, gmbM, inside a A 
II. 928 
of Sst. * 115m Pos. 78°:8 Dist. 1873 
? 118} ie 228-4. 81:7 
35.95 9 
2 MQ qo 297-7 105:0 (1. obs.) 
ie 7) 
Zi 
