( xvii ) 



results gained by the unsurpassed penetration of Elias Fries ; 

 and has never lost the impress of his genius. So great is the 

 value of Habit in minds fully qualified to apprehend and appre- 

 ciate its subtleties, that such minds may not only anticipate 

 what the microscope is to reveal, but help us to understand its 

 revelations. 





