HOW TO OBSERVE THE HEAVENS. 



333 



advantageous nor advisable. 



The northern constellation, to which we have referred, is called Ursa Major, 

 or the Great Bear. The seven stars are only the most conspicuous of those 

 which compose it, the entire number of stars in it being eighty-seven, most of 

 which, however, are so small as not to be visible without, a telescope. Of 

 the seven principal stars one only (that marked , fig. 1), is of the finst imjr- 

 niiude. Three (marked tf, y, and i ), are of the second magnitude, and the rc- 

 m; ; "'i)g three ( <-. , and ) are of the third magnitude. As these stars, being 



Fig. 2. 



