524 



DESCRIPTION OF SPECIES. 



liquefy the gelatine. The network 

 disappears and a little deposit occurs 

 at the bottom of the liquefied 

 area.. 



Inoculated in the depth of gela- 

 tine a whitish cloudy growth forms 

 along the needle track, liquefaction 

 sets in and extends until the gela- 

 tine is completely liquefied. 



On potato a thin crinkled film is 

 formed, which is yellowish or red- 

 dish-yellow in colour. 



They occur on potato. 



Bacillus mesentericus vulga- 

 tus (Plugge). — Rods large and 

 thick, often formingpseudo-threads. 

 They have an oscillating movement. 

 Spore-formation present. 



The colonies are bluish-white and 

 almost transparent, though the 

 centres become gradually opaque. 

 They sink in the liquefied gelatine, 

 and are granular with irregular 

 contour. 



Bacilltis multipediculus 

 (Flugge). — Rods long and slender. 

 Non-motile. 



The colonies consist of a central 

 oval nucleus, from which numerous 

 tapering processes shoot out mostly 

 towards one pole. This form of 

 growth gives a curious resemblance 

 to an insect with feet and antenna. 



Inoculated in the depth of gela- 

 tine a whitish line forms along the 

 track of the needle, from which 

 short processes grow out. 



On potato a rather scanty dirty- 

 yellow growth forms, and the sur- 

 face of the potato becomes dis- 

 coloured around it. 



They are often found as a con- 

 tamination on potato. 



Bacillus muscoides (Liborius) 

 — Rods 1 /i thick, sometimes form- 

 ing threads ; slightly motile, and 

 with round or oval spores at one 

 end. They are anaerobic. 



The colonies ramify and resemble 

 a delicate moss. 



They were found in the oedema- 

 tons fluid of field mice inoculated 

 with garden earth and stale cheese. 



Bacillus mycoides (Flugge).— 

 Rods rather thick, nearly the size 

 of Bacillus anthracis. Motile, 

 often forming long pseudo-threads. 



Oval and highly refractive spores 

 both in the rods and threads. 



Colonies consist of a whitish tur- 

 bidity in which colourless branched 

 and interwoven processes are seen ; 

 these increase rapidly, and after 

 twelve to twenty hours appear like 

 the mycelium of a fungus. 



Inoculated in the depth of gela- 

 tine they form very fine and closely 

 set hairs extending from the track 

 of the needle. Later liquefaction 

 occurs. 



On potato a whitish layer gradu- 

 ally extends over the surface. 



They occur in earth from the 

 surface of cultivated ground. 



Bacillus mycoides roseus 

 (SchoU).— Rods. 



Colonies composed of interlacing 

 filaments. 



Inoculated in the depth of gela- 

 tine they produce liquefaction in 

 the track of the needle ; a reddish 

 scum forms on the surface, and a 

 reddish deposit at the bottom of 

 the liquefied area. 



On agar they produce, in the 

 absence of light, a pink growth. 



Bacillus neapolitanus (Emme- 

 rich). — Short rods "9 fi in width. 





Fig. 207.— Bacillus jSTbapolitanus, x 

 700 (Emmekich). a, From intes- 

 tinal contents in a case of cholera ; 

 h. From peritoneal fluid of an 

 inoculated guinea-pig. 



