n h 
A* iA t^J 
Dr. Heuschsl’s Catalogue of a fecond Thoufand 
been admitted as a direction to the feat of power, the fame 
effect will equally point out the fame caufe in the cafes now 
under con fide ration. There are befides fome additional circum- 
ftances in the appearance of extended clufters and nebulae, 
that very much favour the idea of a power lodged in the 
brighteft part. Although the form of them be not globular, 
it is plainly to be feen that there is a tendence towards fphericity, 
by the fweli of the dimenfions the nearer we draw towards 
the mod luminous place, denoting as it were a courfe, or tide 
©f ftars, fetting towards a center. And — it allegoral expreffi- 
ons may be allowed — it fhould feem as if the ftars thus flocking 
towards the feat of power were ftemmed by the crowd of thofe 
already aflembled, and that while fome of them are fuccefsful 
in forcing their predeceflbrs fideways out of their places, others 
are themfelves obliged to take up with lateral fituations, while 
all of :them feem equally to ftrive for a place in the central 
fwelling, and generating fpherical figure. 
Since then almoft all the nebulas and clufters of ftars I have 
feen, the number-of which is not lefs than three and twenty hun- 
dred, are more conden fed and brighter in the middle; and fince, 
from every form, it is now equally apparent that the central 
accumulation or brightnefs muftbe the refultof central powers, 
we may venture to affirm that this theory is no longer an un- 
founded hypothefis, but is fully eftablifhed on grounds which 
cannot be overturned. 
Let us endeavour to make fome ufe of this important view 
of the conftru&ing caufe, which can thus model fidereal 
fyftemSo Perhaps, by placing before us the very extenfive and 
varied colle&ion of clufters, and nebulas furniflied by my cata- 
logues, we may be able to trace the progrefs of its operation, 
in the great laboratory of the Univerfe. 
if 
