The Mammal. 133 



a new interest in life, a sweeter and higher con- 

 ception of life. She too is born with it into a new 

 world. 



Profound changes take place in her body during 

 the development of the young. 



Reproductive vitality continues at its height, but 

 now taking a very different direction from what it 

 did at first. There is no longer the magnetism that 

 attracted the other sex; the whole vitality is turned 

 towards the completion of the forming life. 



The blood flows in a fuller current, and this flow 

 of rich blood spends much of its power in building 

 up the little one. 



The mother eats for it, she breathes for it; not 

 only this, she prepares for its nourishment after it 

 enters the world, for there now takes place a 

 wonderful transformation in certain of her tissues. 

 The mammary glands develop, those strange inver- 

 sions of the skin which pick out from the blood a 

 little of every material used in the structure of the 

 body. 



When the young come forth this glandular de- 

 velopment is complete; not only has the mother's 

 blood been taxed to supply the forming life, it con- 

 tinues to be taxed to supply nourishment to the 

 still feeble offspring. 



The young of the mammal enter the world help- 

 less, but the mother does not fail them; again 

 from her they draw their nourishment in the life- 

 giving milk which she supplies. 



