WITH A FOURTEEN FEET REFLECTOR. 175 



from such, by the artist, in a way somewhat resembling the imaginary process 

 I have described in Article 11, of laying upon them successive tints of shade. 



15. It will be observed that but one nebula is represented in the figures by 

 this method of lines. It was deemed expedient to adopt, at present, the com- 

 mon mode, that the drawings might be better understood. The originals by 

 lines, however, are preserved, and are considered more accurate sources of 

 reference. 



16. I will now proceed to the immediate observations on the nebulse, only 

 premising that less care was taken to keep records of them in the form of a 

 journal than to embody them in drawings. From these drawings the plates 

 accompanying this paper have been principally compiled. I regret that I have 

 at hand no notes of Mr. Smith's observations distinct from my own, and can, 

 therefore, furnish only such scattered remarks of his as I have happened to re- 

 cord at the time. This deficiency is of little real consequence, since it was the 

 constant practice for each of us to verify the observations of the other. Indeed, 

 in all cases where there could be any doubt, no particular was considered as 

 any thing more than a mere suspicion, whose existence had not been fully and 

 independently corroborated by the other's testimony. 



Observations with the Fourteen Feet Reflector. 



17. NeMa h. 1991. 



1839. July 12. — Saw the triple nebula in Sagittarius. The three clefts which divide it 

 were made out without difficulty, although the whole nebula was extremely faint. Rather 

 low in the horizon. 



Jiug. 1. — Observed the trijid nebula of Herschel. The double star is certainly not as 

 figured in the Phil. Trans., 1833, but rather adhering to the left of the three divisions. (A 

 diagram was made, exhibiting this peculiarity.) The star was not seen triple. 



Jiug. 7. Nebula IV. 41. The nebula much brighter than I have seen it before. Mr. 

 Smith and myself both remarked that the large star (22) immediately adjoining was sur- 

 rounded with a very distinct nebula, not far inferior in brightness to the trifid. It was 

 scarcely to be overlooked, and was seen at the first glance into the field. Its limits are 

 nearly as great as those of the trifid nebula, with which it is nearly, or quite, in contact. On 

 looking over Herschel's observations on this nebula, it was very evident that this is to be 



