214* Dr. Herschel’s Catalogue of a fecond T hovfand 
- comprefiion, or, if - admitted to do this, will convey to us a 
very inftructive confequence : which is, that the ftars which 
are thus fuppofed not to be more comprefled than thofe in 
the former clufler, but only to appear fo on account of their 
greater diftance, muft needs be proportionally larger, fince 
they do not appear of lefs magnitude than the former. As 
therefore, one or other of thefe hypothefes muft be true, it is 
not all improbable but that, in fome inftances, the ftars may be 
rmore comprefled; and in others, of a greater magnitude. 
This variety of fize, in different fpherical clufters, lam how- 
<ever inclined to believe, may not go farther than the difference 
In fize, found among the individuals belonging to the fame 
fpecies of plants, or animals, in their different ftates of age, 
or vegetation, after they are come to a certain degree of growth. 
A farther inquiry into the circumftance of the extent, both of 
condenfation and variety of fize, that may take place with the 
ftars of different clufters, we fhall poftpone till other things 
have been previoufly di feu fled. 
Let us then continue to turn out view to the power which 
is moulding the different aflortments of ftars into fpherical 
clufters. Any force, that ads uninterruptedly, muft produce 
effeds proportional to the time of its adion. Now, as it has 
been Ihewn that the fpherical figure of a clufter of ftars is 
owing to central powers, it follows that thofe clufters which, 
ceteris paribus, are the moft compleat in this figure, muft have 
been the longeft expofed to the adion of thefe caufes. This 
"will admit of various points of views. Suppofe for inftance 
that 5O00 ftars had been once in a certain fcattered fitua- 
tion, and that other 5000 equal ftars had been in the fame 
fituation, then that of the two clufters which had been longeft 
expofed to the adion of the modelling power, we fuppofe, 
y would 
