BACTERIUM INFLUENZA 429 



cultures from this infusion. By this procedure two advan- 

 tages are gained: first, a dilution of the number of bacteria 

 present; and, secondly, the tissue furnishes the amount of 

 hemoglobin necessary for the growth of the organism. Under 

 these circumstances it is, of course, not necessary 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 intra- 

 tracheal injection Pfeiffer succeeded in causing a toxic 

 condition that proved fatal. He does not regard the death 

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

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

 reproduced in animals. 



