246 BACTERIOLOGICAL EXAMINATION OF WATER. 



Massowah possessed four flagella, liquefied gelatine very slowly, 

 and its colonies were quite round, sharply outlined, and had a 

 yellowish colour. It gave the nitroso-indol reaction after 

 twenty-four hours. Its pathogenic action was very like that of 

 the Vibrio Metchnikovi. 



Vibrio Gindha. 



This vibrio was isolated by Pasquale from the water of a well 

 in Gindha. There had been a small epidemic of cholera in the 

 neighbourhood of the well some months before Pasquale's in- 

 vestigations took place. In cultural reactions the vibrio closely 

 resembled Koch's vibrio, but it failed to give the nitroso-indol 

 reaction after twenty-four hours incubation. 



Vibrio Danubicus. 



This vibrio was isolated by Heider from canal water. In 

 many respects it resembles Koch's vibrio. But in the appearance 

 of the colonies, its pathogenic action, and failure to give Pfeiffer's 

 reaction, it differs from the true cholera microbe. 



Vibrio Ivanoff. 



This microbe was discovered by Ivanoff in the stools of a 

 typhoid patient. Pfeiffer believes that the vibrio was the result of 

 an accidental contamination, as Ivanoff at the time was working 

 on the action of disinfectants on stools containing pathogenic 

 organisms. The Vibrio Ivanoff gave Pfeiffer's reaction, and 

 corresponded in every way with Koch's organism, excepting 

 that it showed a tendency to grow out into fine, long, slightly 

 curved, comma forms. 



Vibrio Phosphorescens. 



Dunbar and Rumpel found phosphorescent vibrios frequently 

 in water from the Elbe, Spree, and Rhine. The same vibrios, 

 according to Rumpel, were also found in the filtered pipe-water 

 of Hamburg. These spirilla are very closely allied to the true 

 cholera spirilla, both morphologically and culturally, and also 

 in pathogenic action. Kutscher observed that the vibrios 

 isolated by Dunbar produced in the dark a bluish-green light, 

 which was seen on fresh agar and gelatine cultures, and also in 



