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HEREDITY AND ENVIRONMENT 



spring (Fig. 69) . Hoppe believes that a single 

 drunken debauch may so injure the germ cells 

 of man as to produce abnormal and defective 



Fig. 69. Dwarfed guinea-pigs on the left and normal ones 

 on the right. All are of approximately the same age though 

 the normal ones are nearly twice the weight of the dwarfs. 

 The normals came from normal parents, the dwarfs from a 

 normal mother and an alcoholic father; the dwarfing has 

 therefore been produced by the influence of alcohol on the 

 spermatozoa. (From Stockard.) 



