Human Heredity 



CHAPTER I. 



PROCESS OF POWER CHANGES. 



WHEN Darwin pointed out that offspring 

 resemble their parents, that there is va- 

 riation which makes that resemblance not exact, 

 and that by selecting variations of one kind or an- 

 other great changes can be produced in a few gen- 

 erations, he was simply putting into scientific 

 literature facts well known to common people 

 since long before the dawn of history. But bring- 

 ing those well known but ignored facts into rela- 

 tionship t» other well known facts brought about 

 a revolution in our ideas about the animate world. 

 There is another set of facts which are the 

 common knowledge of common people, and have 

 been known to our ancestors since the days of 

 the cave man. They are facts which are par- 

 ticularly well known to prize fighters, to horse 

 jockies, and to sporting men in general, but they 

 seem to be unknown to science. Certain it is 

 that scientific literature ignores these facts almost 



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