^06 



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 fi in length, -4 to 

 ■5 jj. in width ; singly and inpairs. 



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 t!-5 fi in 

 length, and '75 ^ 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 

 (Sohottelius). — Eods 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 

 doses had no effect on mice and 

 rabbits, but very large quantities 

 produced a toxic efi'ect in rabbits. 

 Swine are not affected. 



They were found by Sohottelius 

 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 

 (TaratofE). — Rods 3'5 to 5 /x long, 

 1-5 /x 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- 

 lander's pneumococcus. They are 

 pathogenic in small animals. They 

 were isolated from human sputum. 



Bacillus cuniculicida, Bacillus 

 of Rabbit SqjticcBmia (see p. 228). 



Bacillus cuticularis (Tils).— 

 Rods from 2 to 3 /x in length, -3 to 

 •5 fi 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 

 (TaratofE). — Rods 3'2 ji long, con- 

 stricted in the middle. Activdy 

 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 



