The invention of telescopes suddenly enlarged the question, and it became necessary to establish a line of demarcation between the number of stars visible to the naked eye and the number visible through the agency of the telescope. Argelander, the author of the "Uranometria," has found that the stars visible to the naked eye, over the entire surface of the heavens, range from 5000 to 5800. Otto Struve, employing Herschel's method of computation, has estimated at upwards of twenty millions (20,374,034) the number of stars visible with the Herschel 20-feet telescope. But, in presence of all the nebulæ resolvable into stellar masses, and before the development of the artificial range of our sight,--in presence, finally, of that hopeless perspective which the more we discover the more we perceive how much there remains to discover,--are we not forcibly carried back to our point of departure? [Illustration: FIG. 4.] Ought not the imagination which, at the first glance, led us to believe the number of stars to be infinite,--ought it not to draw us nearer to the truth? How should the imagination reveal to us, without difficulty, what the intellect, assisted by the senses, can only discover after ages of assiduous exertion? These questions, it seems to us, are worthy of our studious consideration. * * * * * We subjoin a table of the constellations in both hemispheres, with the number of stars in each, for the convenience of our younger readers. NORTHERN CONSTELLATIONS.