99 FRIENDS WORTH KNOWING. 
to exist. Moreover, 
oceans and high 
mountain chains lim- 
it the range of many 
kinds. Europe and 
America have searee- 
ly any species in 
common, save of wa- 
ter- birds and large 
hawks. Those from 
the Pacific coast are 
essentially different 
from those found in 
the Mississippi Val- 
ley. Each « district 
has a set of birds— 
and other animals as 
well—peculiar to its 
peculiar geography. 
Another great cir- 
cumstance,  deter- 
S=>S=S= = . . 
SSS mining the pres- 
YELLOW-BREASTED OHATS. 
ence or absence of 
certain birds in the breeding season, is the abundance or 
