THE CONQUEST OF DISEASE 



Embryolo- 

 gy and 

 eugenics. 



those which have been amputated. The snail 

 can regenerate part of the head, feelers and 

 eyes. Fishes reproduce fins. Salamanders 

 and lizards can reproduce an entire new tail, 

 including bones, muscles, and nerves. The 

 triton reproduces an amputated limb, lower 

 jaw, or eye. These facts are of much biolog- 

 ical importance. Surgery makes use of this 

 knowledge. Who knows but that we stand 

 upon the threshold of epoch-making advances 

 in their further application to man? 



The evolution of embryology has of neces- 

 sity had to depend upon animal experiments. 

 The study of the growth of the chick in the 

 living egg represents one of the most valuable 

 sources of knowledge. Breeding experiments 

 with animals have been carried so far that the 

 study of eugenics has become a science. If 

 we were to apply to man the knowledge that 

 has been made possible by experimenting in 

 perfecting the breeds of animals, we might 

 have a race which in health and form would 

 transcend the conceptions of the gods of 

 Olympus. 



Before knowledge can be applied, it must 

 be acquired. We are witnessing this even now 

 in regard to tuberculosis and typhoid. For 



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