Dr. Herschel’s Astronomical Observations 
272 
compression of the stars is carried to a much higher de- 
gree.* 
VI, 30 is A very beautiful rich cluster of very compressed 
“ small stars."" 
The clusters in this collection are also fine objects ; but, on 
account of their higher compression, require superior tele- 
scopes. 
15. Of the gradual concentration and insulation of Clusters of Stars. 
The existence of a clustering power is nowhere so visibly 
pointed out as in the 39 clusters which are given in the fol- 
lowing collection. My remarks upon them will come with 
more clearness when applied to a particular description of 
some of them. 
VI, 5 is “ A beautiful cluster of very compressed small stars 
of several sizes. It is of an irregular round form, about 12 
“ or 15' in diameter, and the stars are gradually most com- 
“ pressed in the middle."' 
Here the gradually increasing compression of the stars 
points out the central situation of the clustering power ; the 
form is also that of a solid, not much differing from a globular 
figure ; and by the outline of the cluster we may consider it 
as already in an advanced state of insulation ; from these cir- 
* See eight clusters of very compressed'stars ; five in the milky way VI, 27. 30. 
VII, 8. Connoiss. 22. 46. Two near the milky way VI, 10. VII. 48; and one at 
a distance from it VI, 4. 
f See thirty-nine clusters of gradual concentration ; twenty-one in the milky way 
VI, 5. 13. 17. 18. 25. 26, 28. 32. VII, 25. 28. 31. 37. 38. 39. 51. 60. 61. Con- 
noiss. 28. 37. 52. 71. Seven near the milky way VI, 2. 21. 31. 37. 40. VII, 49. 53; 
and eleven at a distance from it I, 41. IV, 63. VI, i. 8. 9. 19. Connoiss. 33. 55. 
68. 74. 77. 
