40 
SIE J. F. W. HEESCHEL’S CATALOGUE 
No. 
by the diagram. There is some confusion among the observations as to whether 
the two nebulae II. 230, 231 really lie np or sp from each other, and it might 
be suspected that the P.D.’s had been read crossways, the R.A.’s being rightly 
set down ; but Lord Itosse’s diagram and measures decide the point in favour 
of the relative situation being here correctly given. 
5051 h. 2302. Not seen by Lord Rosse in two observations. Examined the original 
observation, all clear and apparently correct. The nebula certainly exists in or 
very near the place here set down. 
5061 2849, a. A nebula mentioned by M. D’ Arrest, but not included in his MS. list of 
well-determined nebulse. Should, however, be looked for. 
References to Figures of Nebulae in various works. 
In the following list of figured nebulae, the first column contains the current number 
of the nebula or cluster in the present Catalogue ; the second the number attached to 
it in my Catalogues in P.T. 1833 and C.G.H. ; or if not found in either of these, the 
class and number in my Father’s Catalogues or other sufficient designation. The third 
contains an abbreviated reference to the publication in which the figure will be found, 
viz. — 
P.T. 33. The volume of the Philosophical Transactions of the Royal Society for 
a.d. 1833. 
P.T. 44. Ditto, Ditto, for 18441 
P.T. 50. Ditto, Ditto, for 1850>Lord Rosse’s papers. 
P.T. 61. Ditto, Ditto, for 186lJ 
C.G.H. Results of astronomical observations at the Cape of Good Hope by J.F. W.H. 
R. di. The woodcut diagrams in Lord Rosse’s paper, Philosophical Transactions, 
1861 ; such only being referred to as express some distinct peculiarity not 
elsewhere figured. 
B.A.A. Professor Bond’s Memoirs in vol. iii. N.S. of the Transactions of the Ame- 
rican Academy of Arts and Sciences. 
M.A.A. Mr. Mason’s Memoirs in vol. vii. of the Transactions of the American Aca- 
demy. 
D’Arr. M. D’ Arrest’s Inaugural dissertation and description of the Copenhagen 
Equatoreal, 1861. 
Lam. Dr. Lamont’s “ OefFentliche Vorlesung iiber die Nebelflecken.” Miinchen 1837. 
Lass. Mr. Lassell’s Memoirs in vol. xxiii. of the Transactions of the Royal Astrono- 
mical Society. 
Column 4 contains the number of the Plate in the volume referred to where the figure 
will be found, and column 5 the number of the figure in that Plate. 
The figures annexed to Mr. Dunlop’s catalogue are not included, as for the main part 
they offer no resemblance to the objects figured (when identifiable), and would serve only 
