186 The Bird 
oxygen; and the blood taking up and transporting both 
to every part of the body. 
The normal temperature of our body is about 984°; 
if it rose to 106°, we should soon succumb to the burning 
fever, while the little bird before us is healthy and com- 
fortable with a temperature of 110° to 112°! 
Se : _- a 
Pia 137.—Ameeba, greatly magnified. (Courtesy of Dr. G. L, Calkins.) 
The next time you see a wee chickadee, calling con- 
tentedly and happily while the air makes you shiver 
from head to foot, think of the hard-shelled frozen in- 
sects passing down his throat, the icy air entering lungs 
and air-sacs, and ponder a moment on the wondrous little 
laboratory concealed in his mite of a body; which his 
wings bear up with so little effort, which his tiny legs sup- 
