DESCRIPTION OF SPECIES. 



539 



the needle and on the surface, and 

 liquefaction occurs after some 

 weeks. 



On agar they produce a white 

 growth, and on potato it is brown- 

 ish or yellowish. 



They are pathogenic in small 

 animals. 



They occur in water. 



Bacillus ventriculi (Raczyn- 

 sky). Rods 1-5 to 3 p in length, 

 1 /z in width, singly, in pairs, and 

 in short chains. 



Colonies have a dark nucleus and 

 transparent periphery. 



On agar they form a white layer. 



They were isolated from the 

 digestive tract of dogs. 



Bacillus vermicularis (Frank- 

 land). Large bacilli 2 to 3 /* in 

 length, 1 /z in width, and long 

 threads. Spore-formation present. 



Colonies are irregular in contour, 

 the irregularity increasing as the 

 colony comes to the surface. The 

 peripheral part is composed of 

 closely packed, wavy bands of bacilli, 

 and the centre is irregular and 

 wrinkled. 



The bacilli inoculated in. the 

 depth of gelatine form a flattened 

 band in the track of the needle, and 

 a grey layer on the surface ; lique- 

 faction slowly follows. 



On agar they produce a smooth,, 

 shining, grey layer, and on potato 

 a thick, irregular, flesh-coloured 

 growth. 



They reduce nitrates. 



They occur in water. Probably 

 identical with Bacillus vermicu- 

 losus. 



Bacillus vermiculosus (Zimmer- 

 mann). Rods 1'5 /z in length, -85 p 

 in width, singly, in pairs, very short 

 chains and long filaments. They 

 are slowly motile. 



Colonies irregular ; grey, granu- 

 lar. 



Inoculated in the depth of gela- 

 tine they produce, after four days, 

 liquefaction in the upper part of 

 the needle track, which spreads 

 downwards, and a reddish-grey sedi- 

 ment collects at the bottom of the 

 liquefied area. 



On agar the growth is smooth and 



shining, and on potato yellowish- 

 grey. 



They occur in water. 



Bacillus violaceus (vide Bacil- 

 lus ianthinus). 



Bacillus violaceus Laurentius 

 (Jordan). Rods 3 to 3'6 p, in length, 

 '7 p in width. 



Colonies violet, surrounded by 

 liquefied gelatine. 



Inoculated in the depth of gela- 

 tine liquefaction occurs in the track 

 of the needle, and a violet sediment 

 collects at the bottom. 



On agar the growth is violet, later 

 black. 



On potato there is a copious 

 growth, changing in colour from 

 violet to black. 



In broth a violet colour is pro- 

 duced in the presence of nitrates. 



They coagulate milk, and render 

 it bluish-violet. 



They occur in water. Probably 

 identical with Bacillus ianthinus 

 (Zopf). 



Bacillus virescens (Frick). 

 Rods and filaments. 



Colonies irregular, granular, 

 green. 



On the surface of gelatine they 

 colour the medium green. 



They grow on agar. 



On potato they form a brownish 

 growth. 



In broth a pellicle is formed on 

 the surface, and beneath it the 

 liquid is coloured green. 



They were isolated from green 

 sputum. 



Bacillus viscosus (Frankland). 

 Rods 1*5 to "2 p. in length, singly 

 and in pairs. 



Colonies granular, with hairlike 

 processes extending into the gela- 

 tine, which is liquefied and has a 

 green colour. 



Inoculated in the depth of gela- 

 tine they produce liquefaction and 

 a green fluorescence. 



On agar they form a greenish- 

 j white layer, and colour the jelly 

 I green. 



On potato the growth is brown. 



Probably identical with Bacillus 

 fluorescens liquefaciens. 



Bacillus Zurnianus (List). 



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OF THW 



UNIVERSITY 



