188 



INCUBATION. 



until his subsequent efforts shall have set him free. From this period 

 let your attention be assiduous, but at the same time, cautious, for the 

 hen has heard this cry before you have, and all her maternal anxieties 

 and tenderness, are from that moment so greatly augmented, that any 

 unnecessary interference will only tend to irritate her. 



The following illustrations show the different stages of incu- 

 bation of the egg : 



FIRST STAGE OF INCUBATION. 



MIDDLE STAGE OF INCUBATION 



CHICK JUST BEFORE HATCHING. 



