150 BACTERIOLOGY 



regarding ithe presence of the typhoid bacillus, the experi- 

 ment of growing it on potato is indispensable. In three or 



Superficial coating upon the ^ Ii3il3"3% 



gelatine, -whicii is not liqueflecl rat-* J!i|aLBiff 



Keedle-track 



Pig. 56.— Theust-Cultuhe ix Gelatixe or the Bacillus of Typhoid Feaib. 

 A'INTH DAT. (After Baumgarten ) 



four days at room temperature, and in as little as two at 

 that of the incubator, there apj)ears on the surface a moist, 

 even gloss, although no deposit can be seen even in the part 



