BACILLUS COPEOGENES FCETIUUS 251 



are round, and have on their surface several specks, which 

 under a low power appear sometimes light and sometimes 

 dark. In thrust-cultures the growth takes the form of 

 a nail, and is of a greyish-yellow colour. A yellowish- white 

 deposit develops upon agar ; that on potato shows irregular 

 prominences. Generation of gas takes place in the presence 

 of carbohydrates. 



Bacillus putriiicus coli. — Bienstock found a micro-organ- 

 ism in the contents of the intestine which has the power of 

 decomposing albuminous substances with formation of am- 

 monia, a process which takes place whether air is excluded 

 or is present. It consists of short motile rods, the growth 

 of which does not liquefy gelatine. A yellowish coating 

 develops upon agar after some time. 



Bacillus coprogenes foetidus. — In the intestine of pigs 

 attacked by erysipelas, Schottelius very often found short 

 immotile rods with rounded ends, which play no part in 

 the erysipelas, but can very readily make their way into 

 the blood and neighbouring organs in consequence of the 

 intestinal ulcers. Gelatine is not liquefied, and small pale 

 yellow islets develop in it, which coalesce and form a grey 

 transparent coating. The culture gives off a very unpleasant 

 smell. 



Bacteriuin Zopfi. — Kurt and Fliigge discovered in the 

 intestine of chickens actively motile bacilli, the growth of 

 which does not liquefy gelatine. Threads resembling 

 mycelium appear on the plate even in a day, and in thrust- 

 cultures abundant filaments pass out from the needle track, 

 extending in a radial direction, but often crossing each 

 other. No growth takes place on serum. The bacilli thrive 

 best at a temperature between 20° and 30° C. ; higher than 

 this their vitality is reduced. 



Bacterium aerogenes, Helicobacterium aerogenes, and Bacil- 

 lus aerogenes. — These micro-organisms were found by Miller 



