452 GENERAL ZOOLOGY 



the question if there is a limit beyond which man may not 

 go. Rapid transportation and ready communication are 

 only samples of the commonplace experiences of today 

 which we owe to the development of the physical sciences. 

 Control and prevention of disease and improvement of liv- 

 ing conditions are among the things for which advancement 

 of the biological sciences is responsible. 



There is one direction in which the limit of application 

 of the discoveries of science is not even in sight, — that of 

 race improvement. It is impossible to imagine what the 

 future holds in store for the human race if man is able to 

 make full use of all the knowledge contributed by science. 



