ENERGY OF DEVELOPMENT 



387 



had been formed at the cost of the energy represented by 658 

 small calories. 



Further, 35 per cent. (32 calories) of the total chemical energy 

 of the fresh egg is deposited in the tissues of the young embryo ; 

 48 per cent. (44 calories) is found to a large extent in the abdomen 

 of the chick as a store of potential energy to be drawn upon during 

 early life ; while the balance 17 per cent. (16 calories) has been 

 spent in the development of the chick. That is, about one-sixth 

 of the total energy of a hen's egg is required for the work of 

 elaboration of the tissues of the chick, which tissues contain one- 

 third of the original energy of the egg. 



