DESCKIPTION OF SPECIES. 



52<> 



bread, boiled rice, and starch paste, 

 and more rarely on boiled white 

 of egg and meat. Milk sometimes 

 becomes coloured blood-red by, the 

 growth of this fungus, an appear- 

 ance formerly attributed to a disease 

 of the cow. 



In Paris in 1843 the micro- 

 organism was peculiarly prevalent, 

 attacking especially the bread pro- 

 duced in the military bakehouses. 



Bacillus proteus fluorescens 

 (Jager). — Short thick rods and 

 threads. Actively motile. 



Colonies resemble minute drops 

 of water. 



The rods inoculated in gelatine 

 produce a growth similar to that 

 of Koch's comma-bacilli. 



The jelly becomes greenish, and 

 a pellicle forms on the surface. 



On agar the growth when fully 

 developed is yellowish- white, with 

 a green fluorescence. 



On potato they form a brown 

 layer. 



They are pathogenic in mice. 

 They were isolated from the 

 internal organs of fowls suffering 

 from an epidemic disease. 



BacillTis pseudo-diphtlieriticus 

 (p. 335). 



Bacillus pseudo-tuberculosis 

 (Pf eiffer). — Rods varying in length. 

 Colonies circular, with dark nu- 

 cleus and transparent zone. 



In the depth of gelatine they 

 produce a filament composed of 

 small colonies, and on the surface 

 a patch with concentric markings. 



They grow on agar, but not readily 

 on potato. 



Inoculated in mice, guinea-pigs, 

 rabbits, and hares, they produce a 

 fatal result in from six to twenty 

 days. An abscess forms locally, 

 the lymphatic glands enlarge and 

 caseate, and the internal organs 

 contain nodulesresembling tubercle. 

 They were isolated from the in- 

 ternal organs of a horse supposed 

 to be glandered. 



Bacillus pulpse pyogenes.— 



Rods slightly bent and with pointed. 



ends ; singly, in pairs, and in chains. 



Colonies circular, yellowish- 



brown. 



Inoculated in the depth of gelatine 

 liquefaction occurs in the upper 

 part .of the needle track and ex- 

 tends downwards. 



Intraperitoneal injection in mice 

 produces death in from eighteen to 

 thirty-six hours. 



They were isolated from putrid 

 dental pulp. 



Bacillus punctatus (Zimmer- 

 mann). — Rods 1 to 1-6 in length, 

 •77 fi in width, singly, in pairs, and 

 chains. 



Colonies composed of stringy 

 masses in liquefied gelatine. 



The bacilli inoculated in th& 

 depth of gelatine produce rapid 

 liquefaction in the track of* the 

 needle, and a white deposit. 



On agar the growth is smooth 

 and shining. 



On potato the growth is brownish. 



They occur in water. 



Bacillus putrificus coli (Bien- 

 stock). — Slender, motile rods, 3 /* 

 in length, often less, sometimes 



Fis. 208.— Bacillus Pdtbimcus Coli,, 

 X 1000 (Bienstook). 



forming long threads. Spore-for- 

 mation present. 



Cultivations in gelatine are iri- 

 descent. 



They are constantly present in 

 fseces. 



Bacillus pyocyaneus (Gessard), 

 — Slender rods, singly, in twos 

 and threes, or in irregular masses. 

 Spore-formation present. 



White colonies appear in twenty- 

 four hours, which liquefy the gela- 

 tine. The whole of the medium- 

 acquires a greenish shimmer. 



If the bacilli are cultivated in 

 gelatine, the jelly is liquefied, and 

 coloured green by reflected light, and 

 a deep orange by tr,ansmitted light. 



On agar they form a white layer, 

 and colour the medium a pea-green. 



34 



