HUMAN LIFE 



HUMAN ORIGIN AND 



RELATIONSHIPS * 



THE biologist pays much attention to 

 origins; often too much. Two things can 

 have a common or related origin and yet 

 acquire differences in the course of their 

 development which make, for all practical 

 purposes, two very different things out of 

 them. Quantitative differences may come 

 to be so great that they have all the 

 practical effect of qualitative differences. 

 Or qualitative differences, very small, in 

 deed, when measured by the chemist or 

 physicist and described in the terminology 

 of their sciences, may have very large 

 effects in the practical relation of the 

 substances or things exhibiting them. 

 The sugar-loving man who eats a little 

 of a certain substance which the chemist 

 assures him is made up of the same 

 numbers of atoms of the same three 

 kinds of chemical elements of which 

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