EVOLUTION 



233 



Because of such facts as these, the scientific world has l)ecouie 

 convinced tliai evolutionary change has actually occurred and 

 that the plants and animals with which we are now familiar an; 

 the most recent members of innumerable lines of descent, reaching 



Fig. 132. — Three of the four spooies of Sabatia the distribution of which is 

 mapped in Fig. 131. They are similar but quite distinct from one another. 

 1-3, Sabatia Kennedyana; 4 and 5, S. dodecandra; 6-8, S. dccandra. (From 

 M. L. Fernaid). ■ 



backward for millions of years and embracing a multitude of 



ancestral forms entirely different from anything now alive. 



An admission of the fact of evolution at once raises two grave 



(}uestions, however; whence came the first living thing, the 



