viii A PATHOGENIC BACILLUS 67 



in gelatine plate cultivations, in gelatine streak, 

 stab, and shaken cultures, on and in Agar, on potato 

 and in broth, so much resemble the cultures of the 

 grouse bacillus that unless the two cultures are simul- 

 taneously inspected and compared one with the other 

 it is extremely difficult to distinguish them. The 

 character of the cultures of the grouse bacillus having 

 been already described in previous chapters, it is 

 unnecessary to state them again. 



Making cultivations of the two species at the 

 same time and keeping them under exactly the 

 same conditions, the differences noticed may be 

 stated thus: (i) In plate cultivations of both these 

 bacilli, it is found that the superficially situated 

 colonies of the grouse bacillus are more rapid in 

 appearing and more rapid in spreading, they are 

 flatter, their edges thinner than in those made of 

 our aerobic oedema bacillus ; (2) in gelatine streak 

 culture the band formed in the line of inoculation is 

 broader, flatter, and thinner, and grows quicker in 

 the case of the grouse bacillus ; (3) in stab culture 

 the plate -like growth on the upper free end of the 

 stab is broader, thinner, and spreads out more ; (4) 

 in broth the turbidity of the fluid and the granular 

 precipitate is greater and more copious in the grouse 

 bacillus. 



In shaken gelatine cultures in both cases numerous 



