4fi4 



POTJXTRY CULTURE 



eggs. This albuminous material, becoming smeared over 

 the balance of the eggs, furnishes excellent food for bacteria, 

 which majr find their way into the pores of the egg so smeared 



Fig. ISO. — A l^roken egg showing 

 heavy growth of mold: a, The mold. 



Fig. 190. — An egg the tenth day of 

 incubation: a, The air-cell. 



and hasten its spoiling. This is one source of smeared eggs. 



4m 



Fig. 191. — An egg the twentieth day of incubation: a, The air-cell; 6, the 



embryo. 



