368 THE BEGINNINGS OF LIFE. 



they possess powers of penetration such as known germs 

 do not possess — they will make all these assumptions 

 upon assumptions in order not to believe what is 

 in accordance with the general teachings of science 

 and with their own doctrines in particular, what 

 is testified by experiment, and also that which almost 

 every unbiassed microscopist may learn by direct ob- 

 servation. 



