of new Nebula and Clufters of Stars. 217 
If we have drawn proper conclufions relating to the fize of 
ftars, we may with ftill greater fafety fpeak of their relative 
fituations, and affirm that in the fame diftances from the center 
an equal fcattering takes place. If this were not the cafe, the 
appearance of a clufter could not be uniformly encrealing in 
brightnefs towards the middle, but would appear nebulous in 
thole parts which were more crowded with ftars ; but, as far' 
as we can diftinguifh, in the clufters of which we fpeak, every 
concentric circle maintains an equal degree of compreflion, as 
long as the ftars are vifible ; and when they become too crowded * 
to be diftinguifhed, an equal brightnefs takes place, at equal 
diftances from the center, which is the mo ft luminous part* 
The next ftep'immy argument will be to fhew that thefe 
clufters are of a globular form. This again we reft on the 
found dodtrine of cnances. Here, by way of ftrength to our 
argument, we may be allowed to take in all round nebulae, 
though the reafons we have for believing that they confift of ftars 
have not as yet been, entered into. For, what I have to fay 
concerning their fpherical figure will equally hold good whether 
they be groups of ftars or not. in my catalogues we have, I 
fuppofe, not lefs than one thoufand of thefe round objects# 
Now, whatever may be the fhape of a group of ftars, or of a 
Nebula, which we would introduce inftead of the fpherical 
one, fuch as a cone, an ellipfis, a fpheroid, a circle or a cylin^ 
der, it will be evident that out of a thoufand fituations,, which 
the axes of fuch forms may have, there is but one that can 
anfwer the phenomenon for which we want to. account;, and' 
that is, when those axes are exactly in aline drawn from the 
objedt to the place of the obferver. Here again we have a 
million of chances of which all but one are againft any other 
3 h y.p°- 
