46 The Living Plant 



Some day this will be done, and then we shall know the meaning 

 of autumn coloration just as surely as we now know the causes 

 of the colors of chlorophyll, of fruits, and of flowers. Meantime, 

 it is not the least of the pleasures of science that everywhere about 

 us lie problems of moment, whose progress towards solution we 

 may constantly watch, and the trimnph of whose conquest we 

 may perhaps even share. 



