To this catalogue is prefixed a classification of the multitude of sidereal bodies hitherto discovered, not according to their appa­rent magnitudes or appearances on our earth, but according to their peculiar nature and arrangement in the heavens. They are divided into the twelve following classes : 1. Insulated stars , or such as may be considered out of the reach of mutual attraction; such as our Sun, Arcturus, Capella, Lyra, Sirius, &c.—These indeed, as well as all other heavenly bodies, cannot be said to be entirely free from the influence of the stars surrounding them; but the character assigned to them is, that the attraction in one direction is so counteracted by a contrary influence of the same nature, as to be retained for many ages in a state almost equal to undisturbed rest. Dr. Herschel suspects that we are to look for solar systems only among those insulated stars.