THE BIOLOGICAL ACTIVITIES OF BACTERIA 75 



added in a dilution of 1-10 to young typhoid broth cultures. It 

 seems, therefore, that this power of dissolving bacteria is the prop- 

 erty of many different cells of the animal body and is also present 

 in certain instances in the blood serum. Whether the lytic agent 

 in the serum can be definitely identified with serum protease or 

 lipase has not been determined. 



