Chicken Cholera 599 



the bacilli be planted upon the surface of obliquely solidi- 

 fied gelatin, a much more pronounced growth takes place, 

 and along the line of inoculation a dry, granular coating is 

 formed. There is no liquefation of the medium. 



Bouillon. The growth in bouillon is accompanied by a 

 slight cloudiness. 



Agar. This growth, like that upon agar-agar and blood- 



Fig. 207. Bacillus of chicken-cholera, from the heart's blood of a 

 pigeon. X 1000 (Frankel and Pfeiffer). 



serum, is white, shining, rather luxuriant, and devoid of 

 characteristics . 



Potato. Upon potato no growth occurs except at 37 C. 

 It is a very insignificant, yellowish-gray, translucent film. 



Milk is acidulated and slowly coagulated. 



Vital Resistance. The bacillus readily succumbs to the 

 action of heat and dry ness. The organism is an obligatory 

 ae'robe. 



Metabolic Products. Indol and phenol are formed, 

 Acids are produced in sugar-containing media, without gas 

 formation. 



