BEVIEW AND SUMMAEY. 267 



peculiarities. In a given form of life that presents itself 

 for our study how much is due to heredity? What part 

 has the environmfent played in the production, of color 

 or protective appliances or mechanical arrangements? 

 Through what long wanderings, and how impelled, has 

 each plant settled in its present home, settled only to 

 move still farther with the help of wind or flood or fowl 

 or changing climate ? What were the ancestral forms of 

 the buttercup and daisy? What, through progressive or 

 retrogressive modification, are they now becoming? To 

 one confronted by such questions humility is the only 

 fitting attitude, untiring and well-directed labor the only 

 hopeful road to fuller knowledge. 



