HEREDITY 



faint reaction with his. Meantime, all the 

 races of man are unmistakably of one 

 blood, whatever their color or abode. 



Heredity, therefore, is inseparable from 

 living matter, whether it be in man, in 

 animals, or in trees, or whether in the 

 smallest microscopic particle thereof. In 

 one sense it and physical life are one, for 

 no matter can be living without it. It is 

 absolutely unique, for what else is hered- 

 itary? Certainly nothing physico-chem- 

 ical that we know of. It doubtless has its 

 own laws as everything else has. But laws 

 explain only sequences, and never origins. 

 At every turn we find mysteries connected 

 with heredity which no known law ex- 

 plains. But so accustomed do we become 

 to associate heredity directly with parent 

 and child, linking the one to the other, 

 that we do not know what to say about the 

 worker bee, which for the past hundreds 

 of thousands of years never had a working 

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