BACILLUS COLI COMMUNIS. 457 



to the typhoid bacillus, is in all probability the typhoid 

 bacillus. The same could probably be stated of a 

 bacillus which grew characteristically in glucose bouil- 

 lon and nutrient gelatin, and also showed the specific 

 serum reaction. Probably not one time in ten thousand 

 would such bacilli prove on further investigation not 

 to be typhoid bacilli. A still further test is to inocu- 

 late animals with several doses of the dead bacilli, 

 whose identification is sought, and note whether there 

 is produced a serum which agglutinates typhoid bacilli. 



