HEEEDITY 



ganisms change from age to age and that he 

 himself is one of these changing organisms man 

 has attained not only a new ground for humility 

 of spirit but also a new ground for optimism and 

 for belief in his own supreme importance, since 

 the forces which control his destiny have been 

 placed largely in his own hands. 



The existence of civilized man rests ultimately 

 on his ability to produce from the earth in suf- 

 ficient abundance cultivated plants and domes- 

 ticated animals. City populations are apt to 

 forget this fundamental fact and to regard with 

 indifference bordering at times on scorn agri- 

 cultural districts and their workers. But let the 

 steady stream of supplies coming from the land 

 to any large city be interrupted for only a few 

 days by war, floods, a railroad strike, or any 

 similar occurrence, and this sentiment vanishes 

 instantly. Man to live must have food, and 

 food comes chiefly from the land. 



A knowledge of how to produce useful animals 

 and plants is therefore of prime importance. 

 Civilization had its beginning in the attainment 

 of such knowledge and is limited by it at the 

 present day. If, therefore, this knowledge can 



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