CULTURAL CHARACTERISTICS. 



37 



swarm in the same direction, going very fast at times, and then more 

 slowly. If in great doubt, the mounting of the organisms in a 2% 

 solution of carbolic acid will stop movement if it be true functional 

 motility, while Brownian and current movement are not interfered 



Chflncl'Vo 



FIG. 9. Chart in use at the U. S. Naval Medical School. 



with. In true motility bacteria move in opposite and in all directions, 

 and move away from the place where first observed unless degenerated 

 or dead. 



Reaction of media is of the greatest importance in causing variation 

 in the functions of bacteria, and is one which has until recently been 



