528 



DESCRIPTION OF SPECIES. 



The products injected intrave- 

 nously produce death in from three 

 to twenty-four hours. 



They occur in sour milk. 



Bacillus pestifer (Frankland). 

 — Rods 2;3 fi in length, 1 fi in 

 width, and filaments. Motile. 



Colonies resemble those of Bacil- 

 lus vermicularis. 



On agar they produce a dentated 

 transparent layer, and on potato a 

 flesh-coloured growth. 



They occur in the air. 



Bacillus pliospliorescens geli- 

 dus (Forster). — Very short rods. 



Colonies circular, granular, yel- 

 lowish or greenish. 



The bacilli, inoculated in the depth 

 of gelatine, produce very little 

 growth in the track of the needle, 

 and a white film on the surface. 



On agar and potato the growth 

 is whitish. 



Cultures are photogenic. 



They were isolated from phos- 

 phorescent fish. 



Bacillus phosphorescens Indi- 

 CUS (Fischer). — Eods singly and in 

 pairs, and filaments. Motile. 



Colonies circular, well-defined, 

 greenish. 



The bacilli, inoculated in the 

 depth of gelatine, produce a greyish 

 filament in the track of the needle, 

 and a hemispherical excavation of 

 the jelly at the upper part. Later 

 the jelly is liquefied, and there is a 

 yellowish scum on the surface. 



On agar and potato the growth 

 is white. 



Cultures are photogenic. 



They were isolated from sea- 

 water. 



Bacillus phosphorescens indi- 

 genus (Fischer). — Rods 13 to 1-2 

 /i in length, -i to '7 fi in width, 

 singly, in pairs, and filaments. 



Colonies circular, greenish, and 

 later yellowish. 



The bacilli, inoculated in the 

 depth of gelatine, produce a conical 

 excavation in the upper part of the 

 needle track without liquid con- 

 tents, but with a dry growth on 

 the sides. 



There is no growth on potato. 



Cultures are photogenic. 



They occur in sea-water and on 

 phosphorescent fish. 



Bacillus plicatus (Zimmer- 

 mann). — Minute rods, singly, in 

 pairs, and in short chains. 



Colonies yellowish-white. 



The baciUi, inoculated in the 

 depth of gelatine, form minute 

 isolated colonies, and on the surface 

 a wrinkled patch with gradual lique- 

 faction. 



On potato the growth is dry and 

 yellowish. 



They occur in water. 



Bacillus pneumosepticus 

 (Babfes). — Short rods, '2 fiin width. 



Colonies irregular, semi - trans- 

 parent. 



In gelatine, the bacilli grow in 

 the track of the needle. On agar 

 the growth is whitish and shining. 



Rabbits, guinea-pigs and mice 

 die in two or three days of septi- 

 caemia when a culture is injected 

 subcutaneously. 



They were isolated from a fatal 

 case of septic pneumonia. 



Bacillus polypiformis (Libo- 

 rius). — Slender rods, spore-forma- 

 tion present. They are anaerobic. 



Colonies composed of peculiar 

 convoluted processes. 



In the depth of blood serum they 

 produce a cloudiness at the lower 

 part of the needle track. 



They occur in soil. 



Bacillus prodigiosus (2Iicro- 

 coccus prodigiosus : Cohn. — Blood 

 rain, Bleeding host). Very short 

 rods with rounded ends, and thread 

 forms '5 to 1 /Li in width, forming 

 at first rose-red and then blood-red 

 zoogloea. 



They liquefy gelatine. 



They grow luxuriantly on the 

 sloping surface of nutrient agar- 

 agar, and on sterilised potato, and 

 the colour varies from blood-red to 

 bright-red with sometimes a metal- 

 lic lustre. The cells themselves 

 are colourless. The colouring-matter 

 resembles f uchsine ; it is insoluble 

 in water but soluble in alcohol. 

 The addition of acids changes it to 

 carmine red, and of alkalies to a 

 yeUow colour. 



They appear occasionally on 



