FACTORS DETERMINING PHAGOCYTOSIS 327 



proof that the resistance to phagocytosis in these cases is due to the 

 nature of the bacterial cell body rather than to any secreted anti- 

 opsonic substances. For, after the injection of anthrax bacilli into 

 guinea pigs, they saw that leukocytes would take up uncapsulated 

 bacilli, apparently picking them out of the midst of surrounding 

 capsulated organisms which they were unable to ingest. 



