The Breath of a Bird Los 
millions of one-celled animals! For here before us we 
have what is almost exactly like the little flowing drops 
of jelly called Amcebe which we may find in quiet ponds 
and watch as they move about in search of food; flowing 
around a bit of nutriment, digesting it and flowing away 
from the waste matter which is left. This is just what the 
Fic. 136.—Blood-corpuscles of bird. 
white corpuscles do; they flow around the food which is 
absorbed by the walls of the digestive canal, and in fact 
act like tiny independent animals, parts though they are 
of the great whole. The oval corpuscles carry and dis- 
tribute the oxygen, and here we have in a sentence the 
inner ‘living’ of a bird: the food-canal bringing in food 
and preparing it; the windpipe and lungs admitting 
