FACT AND THEORY 257 



evolution, or improvement, or progress, or what- 

 ever we choose to call it, has stolen another lap 

 on the plant historians. 



And let us remember that the fact that ours is 

 not an exact science, with fixed answers to its 

 problems, is more than made up for by the com- 

 pensating fact that there seems to be no limit 

 to the perfection to which plant achievements 

 may be carried — no impassable barrier, appar- 

 ently (save time — which limits us all, in every- 

 thing), beyond which our experiments may 

 not go. 



Nature did not make the laws; 

 she limits herself to no grooves; she 

 travels to no set schedule. 



Vol. 1— Bur. I 



