BACTERIUM INFLUENZA. 345 



By this procedure two advantages are gained : first, 

 a dilution of the number of bacteria present; and, 

 secondly, the tissue furnishes the amount of haemo- 

 globin necessary for the growth of the organism. 

 Under these circumstances it is, of course, not neces- 

 sary to make a further addition of blood to the culture- 

 medium. 



The only animal that has been found susceptible 

 to inoculation with this organism is the monkey. By 

 intratracheal injection Pfeiffer succeeded in causing a 

 toxic condition that proved fatal. He does not regard 

 the death of the animals as due to infection, but rather 

 to intoxication. The disease, as seen in man, has not 

 been reproduced in animals. 



