of goo new Nebula, and Clusters of Stars . 
4 97 
have already made upon this subject. I therefore proceed in my 
enumeration. 
VI. Of Clusters of Stars . 
These are certainly the most magnificent objects that can 
be seen in the heavens. They are totally different from mere 
groups of stars, in their beautiful and artificial arrangement : 
their form is generally round ; and the compression of the stars 
shews a gradual, and pretty sudden accumulation towards the 
centre, where, aided by the depth of the cluster, which we can 
have no doubt is of a globular form, the condensation is such, 
that the stars are sufficiently compressed to produce a mottled 
lustre, nearly amounting to the semblance of a nucleus. - A 
centre of attraction is so strongly indicated, by all the circum- 
stances of the appearance of the cluster, that we cannot doubt a 
single moment of its existence, either in a state of real solidity, 
or in that of an empty centre, possessed of an hypothetical force, 
arising from the joint exertion of the numerous stars that enter 
into the composition of the cluster. 
The number of observations I have to give relating to this 
article, in which my telescopes, especially those of high space- 
penetrating power, have been of the greatest service, of course 
can find no room in this enumeration. 
VII. Of Nebula. 
These curious objects, which, on account of their great dis- 
tance, can only be seen by instruments of great space-pene- 
trating power, are perhaps all to be resolved into the three 
last mentioned species. Clustering collections of stars, for 
instance, may easily be supposed sufficiently removed to present 
