igS 



MICRO-ORGANISMS AND DISEASE [chap. 



and brownish in transmiltcd light. This bacilkis is non- 

 motile ; it is markedly cylindrical, forming short and long 

 chains and filaments, the above white granules in the young 

 colonics being due to collections of such chains and fila- 

 ments ; it does not curdle milk, does not form gas-bubbles 

 in gelatine shake cultures, and does not form indol in broth : 



iM '' J .'Ai 







Fig. 63^.— Film Speci.mex of Bacillus Pvocyaneus. 



X 1000 



it is, therefore, easily distinguishable from bacillus coli. It 

 approaches the jiroteus Zenkeri inasmuch as in streak culture 

 in gelatine after some days it forms threads and filaments 

 radiating from the centre of the streak which recall the 

 growth of proteus Zenkeri ; we therefore call it (in the 

 laboratory) the sewage variety of proteus Zenkeri, though, 

 as mentioned above, it resembles more the bacillus coli than 



