50 NATURAL INHERITANCE. [chap. iv. 



members are varieties of different types and sub-types. 

 So the distribution of a heavy mass of foliage gives little 

 indication of its growth from separate twigs, of separate 

 branches, of separate trees. 



The application of theory to Schemes, their approxi- 

 mate description by only two values, and the properties 

 of their bounding Curves, will be described in the next 

 chapter. 



