A2^D A SELECTION EEOM THE OBSEEVATIONS MADE WITH THEM. 705 
direct my attention to the fact that Mr. Stonet’s positions are about two degrees in 
excess. A little consideration made it evident that the construction of the universal 
joint which supported the telescope was the cause of the error, and that a certain cor- 
rection must be applied, depending upon the polar distance and the distance from the 
meridian. Mr. Bmnox Stojstey’s measures of H. 1622 are also given, as also his mea- 
sures of H. 2060, and Steute’s measures of both. As Otto Steuve’s measures are no 
doubt as exact as possible, it will be easy to judge of the degree of dependence to be 
placed upon the other measures made by us. 
As to the figured nebulae, little can be added to the information contained in the 
general catalogue. Plates XXV. and XXIX. figures 7 and 35, are from sketches’ by 
Mr. Huxtee, but they had been pre\iously sketched several times by others. We pre- 
ferred Mr. Huxtee’s sketches, thinking they were upon the whole the most accurate, 
containing some additional details. Figure 43, the Dumbell, by Mr. Bindox Stoxet, is 
based on micrometrical measurements, and is thoroughly to be relied upon. No stars 
are inserted which have not been measured. The powers used were low, the ordinary 
working-eyepiece : with high powers the faint details vanish. 
The original observations are in books, in which they were entered each night: 
from time to time they were copied into a folio in the order of right ascension ; and of 
that folio a copy was made for ordinary use in the Observatory. It will be easy there- 
fore to supply, to any person who may be engaged in observing a particular object, all 
the information we possess. AVe have not given the places of the objects brought up to 
the present day, but merely Heeschel’s numbers, to save space. 
It is hoped that further inquiry will be suggested by the questions raised in the following 
obsenations ; they have already opened up to us new grounds for further research. 
IXDEX TO THE FlGUEED NeBUL^E. PlATES XXV. to XXXI. 
Figure. 
Xumber in the 
observations. 
By whom drawn. 
Figure. 
Xumber in the 
observations. 
By whom drawn. 
1 
15 
Mr. Mitchell. 
23 
1306 & 1308 
Mr. Mitchell. 
2 
156 
Mr. B. Stoney. 
24 
1337 
3 
232 
Mr. Mitchell. 
25 
1385 & 1392 
99 
4 
241 
26 
1414 & 1415 
Mr. B. Stoney. 
5 
242 
Mr. B. Stoney. 
27 
1441 
Mr. Mitchell. 
6 
262 
28 
1389 
99 
7 
311 
Mr. S. Hunter. 
29 
1650 
99 
8 
315 
Mr. Mitchell. 
30 
1713 
99 
9 
327 
» 
31 
1905 & 1906 
Mr. S. Hunter. 
10 
131 
32 
1946 
99 
11 
393 
Mr. B. Stoney. 
33 
1968 
Mr. B. Stoney. 
12 
421 
34 
2073 
Mr. Mitchell. 
13 
689 
Mr. Mitchell. 
35 
1744 
Mr. S. Hunter. 
14 
692 & 693 
)) 
36 
2084 
Mr. B. Stoney. 
13 
763 & 766 
37 
2099 
Mr. Mitchell. 
16 
875 
Mr. G. J. Stoney. 
38 
2139 
99 
17 
1011 
Mr. Mitchell. 
39 
2172 
99 
18 
1052 & 1053 
Mr. B. Stoney. 
40 
2241 
Mr. B. Stoney. 
19 
1061 
41 
2245 
Mr. Mitchell. 
20 
1111 & 1113 
42 
2297 
99 
21 
22 
1202 
1245 
Mr. Mitchell. 
43 
2060 
Mr. B. Stoney. 
5 c2 
