EXPERIMENTS Wmi I'.MJILLUS TYl'HOSUS 



247 



Celli (1888) recovered Bacillus typhi abclominalis fi-om the 

 dejections of flies which had been fed on cultures of the same, 

 and he was able to prove that they passed through the ali- 

 mentary tract in a virulent state by subse(iuent inoculation 

 experiments. 



Firth and Horrocks (1902), in their experiments, took a small 

 dish containing a rich emulsion in sugar made from a twenty-four- 



FiG. 97. Agar-agar slope culture of bacteria and moulds deposited by M. domentica 

 caught in the author's laboratoiy (.Jan. 1910) and allowed to make a single 

 journey over the culture medium. 



hour agar slope of Bacillus typhosus recently obtained from an 

 enteric stool and rubbed Tip with fine soil. This was introduced 

 with some infected honey into a cage of flies together with sterile 

 litmus agar plates and dishes containing sterile broth, which were 

 placed at a short distance from the infected soil and honey. Flies 

 were seen to settle on the infected matter and on the agar and 



