MENDELISM 95 



titles by blending or without excluding one another. 

 Piebald races of mice arising from parents with solid 

 but different colors have been cited as illustrations of 

 this sort of inheritance, although it will be seen later 

 in connection with the "factor hypothesis" that another 

 interpretation of this phenomenon is not only possible 

 but probable. 



The distinctions between these three categories of 

 inheritance are diagrammatically represented in Figure 

 15. 



3. JOHANN GREGOR MENDEL 



Our understanding of the working of inheritance 

 in hybridization we owe largely to the unpretentious 

 studies of an Austrian monk, Johann Gregor Mendel, 

 who, although a contemporary of Darwin, was prob- 

 ably unknown to him. Bateson says of Mendel: "Un- 

 troubled by any itch to make potatoes larger or bread 

 heaper he set himself in the quiet of a cloister garden 

 D find out the laws of hybridity, and so struck a mine of 

 uth, inexhaustible in brilliancy and profit." For 

 Mit years Mendel carried on original experiments by 

 Deeding peas and then sent the results of his work to a 

 j jrmer teacher, the celebrated Karl Nageli, of the Uni- 

 - vversity of Vienna. At the time Nageli's head was full of 

 other matters, so that he failed to see the significance of 

 lis old pupil's efforts. However, in 1866 Mendel's 

 results appeared in the Transactions of the Natural 

 'History Society of Briinn, 1 an obscure publication 



1 Verhandlungen naturf. Verein in Briinn. Abhandl. IV, 1865 

 r (which appeared in 1866). 



