e peculiar properties of bacteria have, of course, to be 
re reckoned with in the selection of all methods for com- 
ating them and their effects. They often increase greatly the 
difficulties under which such action is pursued, though modern 
s Ss oO 
completely dammed and circulation in that part entirely sus- 
pended. 
species reproduce also by spores. Not only are such 
‘0 
The production of poisons by these plants is most peal dem- 
onstrated. It has already been rae that if the germs taken 
directly from the body of one suffering from a given disease be 
introduced to the body of another, the disease may be communi- 
cated to him; also that the germs can be propagated in some ex- 
traneous medium, as bouillon, for an indefinite period, and then 
be similarly used to inoculate aun Pa their disease. In 
both these cases, the party to is ted 
can become the source for another inoculation, and so on, show- 
of the disease is lost, as is clearly proven by inoculating an ani- 
