538 



COSMOS. 



perihelia are situated beyond the orbits of Jupiter and Saturn. 

 Of the telescopic comets, there are at the present time upon 

 an average at least 2 or 3 discovered annually. In three suc~ 



in separate succession during seven equal periods, 13, 10, 2, 

 10, 4, 4, and 9. The following are the individual years : 



15001550 



13 Com. 

 16001650 



1607 



1618 



2 Com. 



1700 1750 

 1702 

 1744 



1784 (2) 



4 Com. 



15501600 



10 Com. 

 16501700 



1652 



1664 



1665 



1668 



1672 



1680 



]682 



1686 



1689 



1696 



10 Com. 

 17501800 

 1759 

 1766 

 1769 

 1781 



4 Com. 



9 Com. 



