YELLOW-RUMPED FLY-CATCHER. 
ulting on their wings. Hence, in autumn, 
when these birds migrate into other climates^ 
the swarms of gnats, flies, and beetles, are in 
our latitudes more than usually numerous. 
But, in the tropical countries, where heat and 
moisture conspire to ripen the exuberance of 
insecl life, the Fly-Catchers are more essen- 
tial. All Nature is balanced, and the circle of 
generation and destru6\:ion is perpetual ! The 
philosopher contemplates, with tender melan- 
choly, this cruel system of war; he vainly 
strives to reconcile it with his ideas of bene- 
volence of intention : but he is forcibly struck 
with the nice adjustment of the various parts ; 
their mutual connection and subordination ; 
and the unity of plan which pervades the 
whole!" 
By such excellent, such noble refle(Sl:ions, 
BufFon abundantly compensates for his occa- 
sional imperfections in what may be denomi- 
nated the mechanism of natural history ! 
