THE HATCHING EGG 



107 



consequently their eggs are infertile. Extremely small eggs 

 are usually the first or the last of a clutch, and will produce 



A normal <?g<j 

 both a? to size 

 and 



An egg Which 

 is too 



for hatching 



An egg too larcjp 

 ior hatching; it w 

 apt to be infertile 



Abnormal egg; 



useless ior hatching 



FIG. 62. Normal and abnormal eggs for hatching. 



only small chicks of low vitality. Eggs of medium size, 

 weighing about two ounces, are the best. The shells of eggs 



