33 



bacteriophagus is found which fills up this gap, if need be we can 

 then administer a mixture of the various bacteriophagi. 



We have been able to convince ourselves that, with a dose of 10 

 cM. bacteriophagus per os, the bacteriophagus was already to be 

 found the next day in the faeces of two typhoid patients who had 

 not had it before. 



d'Hekelle has proved that the bacteriophagus is not absorbed by 

 foreign bacilli on which it has no effect. 



Our bacteriophagus however was absorbed by living typhusbacilli 

 who were not influenced in their growtli by our bacteriophagus. 



February 1922. Amsterdam, Lab. for Hygiene of the 



University. 



Proceedings Roval Acad. Amsterdam. Vol. XXV. 



