G. C. 
Observations of Nebule and Clusters of Stars. 49 
1871, Feb. 8. (3 ft.) The canal between the nebula oblongata, and the 
proboscis minor was perfectly dark, it did not appear to be above 25” to 30” 
broad and was of very uniform breadth for some considerable distance. The 
inner part of the sinus magnus was full of F light. 
1871, Dec. 18. There is some difference'in the positions of the stars 113” and 
113’ in the Cape-drawing and in the Birr-drawing. There appear to be 
several stars about that neighbourhood that have not yet been laid down. 
| 1872, Jan. 7. (3 ft.) Attention was especially directed to the Nebula Mairani. 
The gulf near 102 was well seen as also the two round holes. The space 
near 102 seemed like a hole too. Stars 113, and 113,, could not 
be detected with the full aperture of the 3 foot telescope, nor was * 116 
entered in a rough sketch, but it was not looked for so carefully as 113, and 
113,,. About 4°f 118 isa * 13-5 mag. not given in the large drawing in 
the Phil. Trans.; it is however very near the limit of nebulosity. I think 
the nebulosity might easily be traced a good distance north of the neb., 
Mairani. 
1872, Jan. 8. h’s star 116 seen only by glimpses, 113, and 113, not discernible. 
1872, Feb. 3. The stars 54 and 56 seen remarkably well. The 5th star of the 
trapezium was steadily visible, of an intense red colour, contrasting vividly 
with the blue of the nebula and most of the other stars. 
1872, Dec. 31. The 5th star of the trapezium is very red, the 6th showed no 
trace of colour. 
1873, Jan. 3. Patches marked according to the order of bright- 
ness, a and f are the brightest, 3 almost stellar, and ¢ are 
nearly equal, 7 is almost the faintest of all. The outside 
corner of 7 is very indistinct and diffuse, appearing to extend 
south ina tail. The small gulf at « is very black. Theld 
line through the two B st is parallel to the canal, Pos. 91°-1, stars very 
slightly to the south (2” to 4’). A small black hole enclosing and 
extending to the south of the star in 3, 10” long, closed in on the south side. 
Definition good, power 414. There was more uncertainty felt in attempting 
to define the shape of masses a, 3 and Z that was experienced with 6, ¢, n, y, 
and «. 
1876, Jan. 26. I cannot see the luminous tails which, on d’Arrest’s drawing, 
are attached to Struve’s stars 93, 101, 110. 
1876, Feb. 15. The eastern end of the Regio Hugeniana (A in the Birr diagram) 
is curved upward a good deal more than shown on Mr. Hunter’s drawing. 
Peninsula O. Struvii is no doubt connected with the south branch of 
Proboscis major ; the whole peninsula is not quite correct in the published 
drawing ; I see the region between the stars 111 and 135 nearly as represen- 
ted in d’Arrest’s rough sketch (Danish paper on spectra of nebule p. 44), 
the nebulosity south of Promontorium Herschelii is at all events connected 
with the peninsula west of * 135. There are perhaps very faint luminous 
rays south of stars 93, 101, 110, but they are certainly not so bright as on 
d’Arrest’s drawing. (I have not seen them on any other). 
1876, Nov. 17. The “nose” on the f end of the Huyghenian region is certainly 
eurved upward. The A immediately north of the trapezium is probably 
concave f. Last winter's remarks about the Peninsula O. Struvii seemed 
to be confirmed. 
1876, Nov. 19. Examined the region round the stars 32 and 35 (np the trapezium). 
The border round the cavity is far too bright in the drawing on the f side, and 
the canal south of * 35 is near the * filled with F neby. which sometimes 
gives the cavity an oval appearance, and which probably (as Lord Rosse 
thought) gives rise to the elbow-like corner in the drawing. ‘The f side of 
the A between stars 75 and 87, is perhaps quite straight, sometimes it looks 
convex, sometimes (to D at least) concave. A F * was seen midways between 
st 111 and 122 and I think one between 125 and 131. 
|e ne 
TRANS, ROY. DUB. SOC., N.S. VOL. II. H 
