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BACTEEIOLOGY 



inoculation, and conies to resemble a capillary tube as the 

 liquefaction advances downwards and the evaporation pro- 



- Superficial air-bubble 



■ Needle-track 



Fig. 50.— Theust-Cdltuee in Gelati.ve of the Ciioleba Bacillus (Thied Day ). 



grasses. When liquefaction has gone still further the 

 bacilli sink in the needle-track, and the coherent mass of 

 bacteria forms a loose thread which is sometimes thicker 



