VARIATION UNDER NATURE 97 



nature the forms of life which are now dominant tend to 

 become still more dominant by leaving many modified 

 and dominant descendants. But by steps hereafter to be 

 explained, the larger genera also tend to break up into 

 smaller genera. And thus, the forms of life throughout 

 the universe become divided into groups subordinate to 

 groups. 



-Science — 5 



