502 



DESCRIPTION OF SPECIES. 



the track of the needle, while 

 small chrome-yellow hemispherical 

 masses develop on the free surface. 



On potato they form a chrome- 

 jellow growth. 



They occur in water and on the 

 skin. 



Bacillus berolinensis Indicus 

 (Classen). — Slender rods, singly, in 

 pairs, and short chains ; capsulated. 



Colonies at first whitish acquire 

 in a few days an indigo-blue colour. 



On the surface of gelatine they 

 form a blue layer, which slowly 

 spreads. 



On the surface of agar the indigo- 

 blue colour is very marked. 



On potato they grow abundantly, 

 and develop the same colour. The 

 pigment is insoluble in alcohol, 

 •chloroform or water, soluble in 

 strong acids, and decolorised by 

 ammonia. 



They were isolated from river 

 water at Berlin. 



Bacillus l)rassicaB (Pommer).— 

 Rods 1-9 to 54 fi in length, -91 to 

 1"2 iji in width, and filaments. They 

 form spores. 



Colonies have the appearance of 

 a fine mycelium. 



Inoculated in the depth of gela- 

 tine the growth in the track of the 

 needle sends off fine filaments, and 

 liquefaction quickly follows. 



In the depth of agar white 

 •colonies form in the track of the 

 needle, and on the surface the 

 growth is first cloudy and later 

 yellowish. 



They were isolated from infusion 

 •of cabbage. 



Bacillus l)revis (Mori).— Rods 

 ■25 ij. long and '8 fi broad. Non- 

 motile. 



Colonies pale-yellow ; non-lique- 

 fying- 



Inoculated in the depth of gela- 

 tine small dots appear along the 

 needle track and a pale yellowish 

 growth on the surface. 



On agar at 35° C. a yellowish 

 and on blood serum a greyish 

 growth appears in two or three 

 •days. They do not grow on potato. 

 In broth they form a white cloudy 

 ■deposit. 



Mice inoculated subcutaneously 

 die in from sixteen to thirty hours. 

 They are also pathogenic in guinea- 

 pigs and rabbits. 



They were found in drain water. 



Bacillus brunneus (Adametz 

 and Wichman). — Rods small and 

 slender. Spore formation present. 



Colonies at first white, later 

 brownish. 



Inoculated in the depth of gela- 

 tine the growth occurs along the 

 track of the needle and also on 

 the surface, developing a brownish 

 colour in the surrounding gelatine. 



They occur in water. 



Bacillus buccalis fortuitus 

 (Vignal). — Rods 1-4 to 3 /i in 

 length, singly, and in pairs. 



Colonies circular and liquefymg. 



Inoculated in the depth of gela- 

 tine liquefaction occurs slowly, and 

 white flocculi occur in the liquid, 

 and later subside to the bottom. 



In broth they produce turbidity 

 and a skin on the surface. 



They were isolated from saliva. 



Bacillus buccalis maximus 

 (Miller).— Rods 2 to 10 ft in length, 

 1 to 1"3 fjL in width, and filaments 

 30 to 150 /li in length. 



They occur in the mouth. 



Bacillus buccalis minutus (Sig- 

 nal). — Rods '5 to 1 ^ in length, 

 and slightly less in width. 



Colonies circular and faintly 

 yellow. 



Inoculated in the depth of gela- 

 tine they form a yellowish-white 

 growth in the track of the needle, 

 and a patch of the same colour on 

 the surface ; liquefaction com- 

 mences slowly, and extends down- 

 wards until the gelatine is com- 

 pletely liquefied and a yellow mass 

 collects at the bottom of the tube. 

 In broth there is a similar deposit, 

 and an iridescent pellicle on the 

 surface. 



On potato they form a yellow film. 



They were isolated from saliva. 



Bacillus butyricus, (Praz- 

 mowski. Bacillus amylobacter, Van 

 Tieghem ; Bacillus of butyric acid 

 fermentation). — Rods 3 to 10 ^ long, 

 under 1 fi wide, often indistinguish- 

 able from Bacillus subtilis. They 



