DESCRIPTION OF SPECIES 



443 



PROTEUS VULGARIS. 



Source and habitat — Putrid meat, 

 excreta, bad milk, etc. 



Morphology — Slender thin rods or as 

 threads ; i-6 to 4 m long, 0-4 to 0-5 

 fi. broad. 



Staining reaction — Ordinary stains, 

 and by Gram's method. 



Flagellaj motility — Active motility ; 

 many long flagella. 



Spore formation — None. 



Biology : cultural characters {includ- 

 ing biochemical features) — Rapid 

 growth at all ordinary temperatures 

 and in ice. Indol and HoS are 

 produced in cultivation. 



Bouillon — Very cloudy and 

 abundant precipitate. 



Gelatine plates and tubes — Grey 

 delicate colonies; rapid liquefaction. 

 Some small and punctiform, with 

 sharp outlines and of a greyish- 

 yellow colour ; others larger, colour- 

 less, and with wavy lobulations. 



Agar plates and tubes — Tube 

 shaped liquefaction in stab-cultures 

 and saucer liquefaction in plates ; 

 in both cases the liquefied fluid is 

 turbid. 



Potato — Scanty growth ; dull, 

 raised, and of whitish-yellow colour. 



Milk — Is coagulated in 2 to 3 

 days, and later is again liquefied, 

 and eventually yellow in colour and 

 acid in reaction. No gas. 



Agar — Greyish- white colonies, 

 non-characteristic ; grey, shiny, 

 moist surface growth, veil-like and 

 of rapid growth. Water of con- 

 densation very cloudy, and whitish- 

 yellow in colour. 



Anaerobic and aerobic. 



Vitality — Considerable against 

 chemical and thermal agencies. 



Pathogenic for animals. 



PROTEUS ZENKERI. 



Source and habitat — Decomposing 

 meat, fluids, sewage, milk, etc. 



Morphology — 5 to i m thick, 2 to 4 m 

 long ; long threads in bouillon. 



Staining reaction — Ordinary aniline 

 stains. 



Biology : cultural characters (^includ- 

 ing biochemical features). 



Gelatine plates and tubes— Round 

 colonies, with branching processes 

 radiating widely. Non-liquefying. 

 In stab-culture, along the needle 

 track are formed lateral extensions 

 or thin sheets (like an inverted fir 

 tree). Surface growth thin and 

 irregular. 



Agar plates and tubes — Growth 

 spreads rapidly from needle track, 

 with radiating fibres of growth. 



Potato — Dry, whitish-brown, 

 rough growth. 



Milk — Produces slightly alkalin- 

 ity, and in time a sliminess. 



Anaerobic or aerobic — Facultative 

 anaerobe. 



PathogeTiesis — Hauser maintains 

 that this bacilli is transformable 

 into Proteus vulgaris, which pos- 

 sesses poisonous properties. 



STAPHYIiOCOCCUS PYOGENES 



AUREUS. 



Source and habitat — Milk, water, air, 

 on skin of healthy persons, in milk 

 of healthy women ; in many 

 diseases, especially suppurative 

 conditions. 



Morphology — Micrococci in masses ; 

 round, small ; on an average about 

 0-8 li in diameter ; masses or pairs, 

 or singly, usually in grape-like 

 clusters. 



Staining reaction — Ordinary stains. 



Flagella : motility — No flagella ; 

 non-motile. 



