AVES. 



415 



selection are remarkable in the extreme. The egg and fowl 

 industry is one of the most important in the country, amount- 

 ing according to estimates to more than 400,000.000 dollars 

 annually. In 1901, one and one-half billion dozens of eggs 

 were produced on the farms of this country. It is readily seen 

 that this is one of the large sources of food for man (Figs. 



214-216). 



FIG. 216. 



FIG. 216. Skulls of gallinaceous Birds, as Partridge, Grouse, etc. Photographed from 

 the specimens by Dr. R. W. Shufeldt. Adult. J natural size. 



Questions on the figures. Compare these skulls and note the points of 

 similarity and dissimilarity. Find the position of eye, ear, and nares. 

 What are the chief points of contrast between these skulls and that of the 

 owl (Fig. 219), and of the flamingo (Fig. 212)? 



