Observations of Nebula and Clusters of Stars. 127 
G. C. | h. & H. | a 
1856, May. 3. Last obsn. correct in detail ; I strongly suspect centre r and a * 
in the f branch, and perhaps neby round the * n. 
1857, Apr. 19. The bend in p end quite easily seen, the F neby towards the * 
sf is not nearly so certain. Sketched [see P. T. 1861, pl. XXVIIL, 
fig. 28]. 
1858, ee 15. I can add nothing to my drawing and observations of last year, 
which are fully confirmed. (VII. obs.) 
1596= | 1876, Apr. 13. p B, pS, mbM, 4 st p. 
IT, 328 Pos. 
* 13:14m 225°-0 (2) 
Nearest * (13m) of trapezium 300°3 (2) 
1599= ) 
IIT. 402 |! 1855, Apr. 13. Both arepB, 8, R, bM. 
1600— +! 1855, Apr. 17. A third v F neb nearly n of the f one. 
R. nova } 
1602— | 1873, Apr.18. cB,8S, Rorvl E pf, gbM. * 15mn, 
IL. 667 Dist. 58-7. (1. obs.) 
1601— | 1874, Mar. 22. pF, pL, R, has an 11m * on it; the * is very sharp and 
TL. 25 distinct. This * to * 16m Pos. 248-°2, Dist. 72:9. 
1877, May 3. R, sbM R Nucl, F surrounding neby is 1 E np sf. v F *sp Nucl, 
inv in the outlying neby. No * near. (II. obs.) 
1604— )| 1855, Apr. 17. The sp one is mE, bM, a v F but certain * a little f the sf end, 
IIL. 404 | *in np end. ‘The other neb is v F', not vS and has no Nucl. 
1605= ;| 1856, Mar. 28. 1604 is p B, 1 E, has Nucl, alsoa*atnpend. 1605 isv F,R 
TL. 405 ) and its light equable. (II. obs.) 
1612— )| 1877, Apr. 4. Found only one neb, v F, v8, stellar, no other neb found. A * 
ILL. 45 | 12m about 4’ nf. The ground appeared milky round about. 
1612= f [h seems also to have seen but one neb, viz., 1612, his “* 11m n” may be my 
Ll. 46 J * 12m. He says it has a *inv atsend and* 6m 15's. H. has “Two, 
mistaken for one, but 240 showed them both.”] (1. obs.) 
1622-— )| 1843, Sept. 18. (3 ft.) A great number of st clearly visible in it, still Herschel’s 
M. 51 =! rings not apparent, at least no such uniformity as he represents in his 
1623= f drawing. 
I. 186 }| 1844, Apr. 11. (38 ft). Two friends assisting, both saw centre clearly resolved. 
1845, Apr. During this month M. 51 was for the first time examined with the 
6 foot and its spiral character immediately noticed, but no record is left of 
these early observations. 
1848, Mar. 31. Bore distinctly a power of 1000, in the L Nucl Lord Rosse 
detected a manifest spiral arrangement. Sky clear, definition perfect. 
1848, Apr. 26. Saw the spirality of the principal Nucl very plainly, also in the 
smaller Nucl. 
[In the years 1849-51 a good many measures of the stars in this nebula were 
made ; they were published in the P.T. 1850, p. 510, and 1861, p. 737. As 
the time, when the measures of position angles were taken, was not noted, 
we have no means of applying the correction rendered necessary by the form 
of the universal-joint of the tube, which in NPD 42° amounts to 7°27’ at 
40™ hour-angle. Asa great number of measures were taken in the years 
1872-74 with every possible care, it has not been thought necessary to reprint 
the earlier ones here. 
1852, Apr. 14. The second Nucl [h 1623] is, € think, spiral, but the present 
speculum will not verify this. 
