Astronomy. 75 
III. Astronomy. 
1. On the Motions of some of the Ne 
Earth ; by Witt1am Hueeins.—The observations on the motions 
of the gaseous nebule to the stars and to our stellar system by 
observations of their motions of recession and approach. 
Since the date of the paper to which I have referred, I have 
availed myself of the nights sufficiently fine (unusually few even 
for our unfavorable climate) to make observations on this point. 
The inquiry was found to be one of great difficulty, from the faint- 
ness of the objects and the very minute alteration in position in 
the spectrum which had to be ob 
t 
that the brightest line in the nebular spectrum is not sufficiently 
This line appeared to meet é 
narrow, of width corresponding to the slit, defined at both edges, 
and in the position in the spectrum of the brightest of the lines 
of the nebule. ; 
* Proceedings of the Royal Society, vol. xx, p. 392. + Ib., p. 380. 
