320 BIOLOGY AND ITS MAKERS 



observations upon which he based his conclusions were made 

 upon the transfusion of blood in rabbits and their after- 

 breeding. He studied the inheritance of stature, and other 



FIG. 96. FRANCIS GALTON, 1822-1911. 



characteristics, in human families, and the inheritance of 

 spots on the coat of certain hounds, and was led to formulate 

 a law of ancestral inheritance which received its clearest ex- 

 pression in his book, Natural Inheritance, published in 1889. 



He undertook to determine the proportion of heritage 

 that is, on the average, contributed by each parent, grand- 



