474 EVOLUTION, GENETICS, AND EUGENICS 



it was fifty years ago, but most of us are growing to be a little pessi- 

 mistic about the whole matter. New hereditary conditions are con- 

 tinually being produced in nature, and some have been induced by 

 experimental means. Is this not enough for the evolutionist without 

 dragging in the extremely doubtful and apparently unprovable 

 Lamarckian factor? How much we have to rely on as the creative 

 factor in evolution is brought out in the next chapter. 



