.506 



DESCRIPTION OF SPECIES. 



white, and on potato yellowish- 

 white. 



In broth they produce turbidity 

 and a scum on the surface. They 

 reduce nitrates. 



They occur in sewage. 



Bacillus coli communis 

 (Escherich). See p. 344. 



Bacillus coli similis (Stern- 

 berg). Rods 1 to 3 /u in length, -4 to 

 5 p in width ; singly and in pairs. 



Colonies circular and pale brown 

 in colour. 



In the depth of gelatine they 

 form a scanty growth in the track 

 of the needle, and on the free sur- 

 face a translucent film with irregu- 

 lar margins. 



On potato the growth is pale 

 brown or dirty white. 



They were isolated from human 

 liver after death. 



Bacillus constrictus (Zimmer- 

 mann). Rods from 1'5 to G'5 p in 

 length, and '75 /n in width. The 

 rods are segmented. 



Colonies are circular, granular, 

 and greyish-yellow. 



In the depth of gelatine they 

 form a filament in the track of the 

 needle and irregular yellow heaps 

 on the free surface. 



On the surface of agar the growth 

 consists of a yellow shining layer, 

 and on potato the same colour is 

 produced. 



They occur in water. 



Bacillus coprogenes foetidus 

 (Schottelius). Rods about as large 

 as Bacillus subtilis, but shorter. 

 They are non-motile. Spore-for- 

 mation occurs when the bacilli have 

 access to the air, but not in the 

 .animal body. 



In the depth of gelatine a fila- 

 ment forms composed of yellow- 

 ish compact colonies ; and on the 

 surface a fine transparent film ; 

 cultures emit a strong putrefactive 

 odour. 



On potato they form a light grey, 

 dry layer. 



Subcutaneous injection of small 

 <loses had no effect on mice and 

 rabbits, but very large quantities 

 produced a toxic effect in rabbits. 

 Swine are not affected. 



They were found by Schottelius 

 in the intestine in cases of swine 

 erysipelas. 



Bacillus coprogenes parvus 

 (Bienstock). Very short rods. 



On the surface of gelatine they 

 form a very limited, almost in- 

 visible, growth in the track of the 

 needle. 



In mice they produce oedema and 

 death in thirty-six hours, and in 

 rabbits a local rash and death in 

 eight days. 



They were isolated from human 

 evacuations. 



Bacillus crassus aromaticus 

 (Taratoff). Rods 3'5 to 5 /LI long, 

 1-5 ft in width ; constricted in the 

 centre. 



Colonies appear in the form of 

 cup-shaped depressions and pro- 

 duce a fruit-like odour. 



In gelatine they grow in the 

 track of the needle, and later 

 produce a funnel-shaped area of 

 liquefaction. 



They occur in well water. 



Bacillus crassus sputigenus 

 (Kreibohm). Short thick rods, 

 sometimes curved; capsulated. 

 Colonies greyish- white. Cultures 

 in gelatine resemble those of Fried- 

 liinder's pneumococcus. They are 

 pathogenic in small animals. They 

 were isolated from human sputum. 



Bacillus cuniculicida, Banllu* 

 of Rabbit Septicaemia (see p. 228). 



Bacillus cuticularis (Tils). 

 Rods from 2 to 3 p in length, *3 to 

 '5 p. in width, and filaments. 



Colonies are yellow and the gela- 

 tine is liquefied. 



In the depth of gelatine they 

 produce liquefaction, and a skin 

 forms on the surface. 



On potato the growth is slimy 

 and yellow. 



They occur in water. 



Bacillus cuticularis a 1 b u s 

 (Taratoff). Rods 3'2 /* long, con- 

 stricted in the middle. Actively 

 motile. 



Colonies are opalescent and 

 bluish-white. 



Inoculated in the depth of gela- 

 tine they form a white rosette- 

 shaped growth on the surface and 



