618 THE COMPLETE GRAZIER. BOOK yn. 



c, the second membnine, slightly attached to B, except at the large 

 end of the egg, where they separate and form 



D, the air space ; 



E, the albuminous portion, or white, of the egg, in three layers 

 first, liquid ; second, semi-liquid ; and third, the inner white ; 



F, the chalazae, two twisted cords of denser albumin, taking the 



Fig. 172. Development of Chicken Fig. 173. Development of Chicken 

 Third Day. Seventh Day. 



form of a spiral in the direction of the longer axis of the egg, and 

 forming a ligament by means of which the yolk remains suspended in 

 the midst of the albumin ; 



G, H, i, the membranes of the yolk ; 



j, the .yolk, which is the richest part of the whole egg, being composed 

 of albuminous matters, organic salts, of vitelline, of colouring matters, 



Fig. 174. Development of Chicken Fig. 175. Development of Chicken 

 Twelfth Day. Fifteenth Day. 



of phosphoric acid, and of a fatty phosphoric substance. From it the 

 embryo derives its sustenance during the process of incubation ; 



K, the utricle, wherein is the germinal vesicle ; 



L, the germ, known from its yellowish white colour. 



It has been already stated that the two conditions needed for the 

 development of the chicken are heat and moisture. But it is important 

 here to state that there must be the germ of life within the egg. Heat 

 and moisture would have no effect upon an unfertilised egg, and the 



