182 



DESCRIPTION OF THE ORGANISM. 



A culture of Danysz's virus obtained from the Pasteur Institutehad 

 the following characteristics : 



The organism is a cocco-bacillus showing distinct motility. Stains 

 well by the ordinary stains, but does not stain by Gram's method. 



It grows well at ordinary room temperature, also in the incubator, 

 and on all the ordinary media. In bouillon it produces a uniform 

 cloudiness in twenty-four hours. A slight scum forms after several 

 days' growth, which falls to the bottom when shaken. In Dunham's 

 solution it grows well, but produces no indol in twenty-four hours' 

 growth. 



It does not coagulate milk. 



It grows the whole length of the stab in gelatin, forming small 

 whitish colonies in the deeper portions of the tube. It does not grow 

 over the entire surface of the gelatin tube; does not liquefy gelatin. 



It grows under anaerobic conditions. 



It ferments, glucose bouillon, but not lactose bouillon. In glucose 

 bouillon it produces l-COj, 5-II. It also produces H^S. 



From a general biological standpoint it is plain that this bacillus 

 belongs to the para-typhoid group, and is very similar to the bacillus 

 of hog cholera as well as the Bacillus icteroides, also B. enteritidis, so 

 far as its morphological and cultural characteristics are concerned. 



In the following table the fermentations produced by various mem- 

 bers of this group upon certain carbohydrates are shown: 



Organism. 



Lac- 

 tose. 



Glu- 

 cose. 



Levu- 

 lose. 



B. typhosus 



B. dysenteriffi Shiga 



B . dysenterise Krusc 



B . parartyphosus A 



B. parartyphosus B 



B, para colon 



B. acidi lactic! 



B. hog cholera 



B. typhi murium Danysz 



B. icteroides 



B, enteritidis 



B. coli communis 



+ 



+ 

 + 

 4- 

 -I- 

 + 

 + 

 + 

 + 



(a) 



(") 



-t- 

 + 

 + 

 + 



+ 

 + 



a Or bubble. 



