148 THEORY OF EVOLUTION 



according to their weights, and those between 

 certain weights put into cylinders, the cylin- 

 ders, when arranged according to the size of the 

 beans, will appear as shown in figure 72. An 

 imaginary line running over the tops of the 



FIG. 72. Beans put into cylindrical jars according to the 

 sizes of the beans. The jars arranged according to size of 

 contained beans. (After de Vries.) 



piles will give a curve (fig. 73) that corresponds 

 to the curve of probability (fig. 74) . 



If we stand men in lines according to their 

 height (fig. 75) we get a similar arrangement. 



