* 
36 D. Trowbridge on the Nebular Hypothesis. 
revolution at the distance of millions of miles. There is, we 
might say, a sublime simplicity in this indifference of the grand — 
the stars, must the nebula appear to change their relative parts 
or positions in the heavens! We must, therefore, expect little 
from the motion of nebuls or even clusters, in confirmation of - 
the nebular hypothesis. We must look to the general con- — 
formation of nebulz and of clusters. Lord Rosse has within — 
a comparatively few years, by means of his great reflectors, © 
shown that many of the nebuls are of the spiral form. They” 
appear as if they possess a rotatory motion on an axis, and this — 
motion has so far increased as to project some parts of the nebu- 
le tangentially, and thus to break up the spheroidal form, caus: — 
ing parts of the nebulz to fly off in one or more streams. The — 
Fe ee Oe ok Mahe 
a Vestiges of Creation. Harper’s Ed., p.17. 
ee am unable to ascertain in what direction, if any definite one, double stars r 
volve around their common center of gravity. Who will give the required infor- 
mation ? It is worthy of attention : *@ 
; 
Ann. of Sci. Disc. for 1852, pp. 187-8. 
