270 Dr. Herschel’s Astronomical Observations 
attracting centres near each other, situated so as to inclose a 
certain space, the stars in which, then, cannot be accumulated, 
while the clustering power arising from the combined attrac- 
tions will be exerted on the surrounding stars. 
Connoiss. 4 is “A rich cluster of considerably compressed 
“ small stars surrounded by many straggling ones. It con- 
“ tains a ridge of stars running through the middle from south 
preceding to north following. The ridge contains 8 or 10 
“ pretty bright stars. All the stars are red.*^ 
The curious constfuction of this cluster is sufficiently ac- 
counted for by the bright stars in what is called a ridge ; the 
small stars accumulated about it having somewhat the ap- 
pearance of the shelving sides of the ridge. The observed red 
colour was probably owing to the low situation of the object. 
VII, 26 is “ A cluster of extremely small and pretty much 
“ compressed stars, with a few large ones in the shape of a 
“ hook.*' 
From what has been remarked already it will not be neces- 
sary to enter into a consideration of the cause of the uncommon 
form of this cluster. 
Connoiss. 30 is “ A brilliant cluster, the stars of which are 
“ gradually more compressed in the middle. It is insulated, 
“ that is, none of the stars in the neighbourhood are likely to 
“ be connected with it. Its diameter is from 2' 40" to 3' 30". 
“ Its figure is irregularly round. The stars about the centre 
“ are so much compressed as to appear to run together. To- 
“ wards the north, are two rows of bright stars 4 or 5 in a 
“ line." 
In this accumulation of stars, we plainly see the exertion 
of a central clustering power, wffiich may reside in a central 
