ABNORMAL EGGS 



403 



velopment; their growth is identical, they have tlie same blood 

 supply, and both drop into the oviduct at the same time. The 



Normal fresh egg. 



Fresh egg showing blood dot. 



Fertile egg after 24 hours of incubation. Infertile egg after 24 hours of incubation. 



{Courtesy U. S. Dep't Agriculture) 

 Fig. 262. — Changes affecting the appearance of eggs. 



formation of the albumen seems to be entirely automatic, hence 

 the same mass surrounds both yolks, and later they are framed 

 by the same shell. 



