BACILLI 445 



BACILLUS OCHRACEUS 



LIQUEFIES GELAXrNE 



Authority.— Zimmermann, Die Bakt^ricn unssrer Trlnk- imd Nutsiodsser, 

 inshesondere des Wassers der Chemnitz ey- Wasserleitung, Chemnitz, 1890. 



"Where Found.— In the Chemnitz water supply. This bacillus was isolated 

 and described previously by Fazio, I Microhi delle Acque minemli, Napoli, 

 1888. 



Microscopic Appearance.— Bacillus from 0-65 to 0-75 M broad, and 1-25 to 4-5 ^ 

 long, with rounded ends. It occurs in pairs also, forming longer threads. In 

 stained preparations it sometimes appears to be enveloped in a capsule. Slow 

 snake-like movement. 



Cultures.— 



G-ELATiNE Plates. — Forms in the depth small pale yellow ball-shaped colo- 

 nies; the gelatine above becomes liquid and the colony rests finally in a cup- 

 shaped depression. The colour becomes more intense, and is of a golden 

 yellow ochre. Under a low power they appear as granular and brownish 

 yellow discs, covered later with small wart-like protuberances. 



GrELATiNE TuBES. — Forms a funnel-shaped depression, but when the lique- 

 faction has extended right across the tube it proceeds more slowly, A pale 

 yellow precipitate collects, which later becomes yellow ochre in colour, and 

 when shaken renders the liquid cloudy and of a pale yellow ochre colour. 



Agar-agar. — Forms a somewhat restricted yellow ochre expansion. 



Potatoes. — Forms a thin yellow ochre expansion. 



^LEMON-YELLOW BACILLUS' 



LIQUEFIES GELATINE 



Authority. — Maschek, Die Bakterien der Nuts- und Trlnkwdsser, Adametz, 

 Vienna, 1888. 



Where Found. — In water. 



Microscopic Appearance.— Short bacillus. Lively pendular movements. 



Cultures. — 



Gelatine Plates. — Forms circular yellowish white colonies ; the centre is 

 light brown, with radial extensions towards the periphery. 



Gelatine Tubes. — Forms a nail-head growth of a yellow colour. The 

 gelatine is liquefied and assumes a lemon-yellow colour. 



Agar-agab. — Forms a lemon-yellow surface expansion. 



Potatoes. — Forms a lemon-yellow expansion. 



'OEANGE-EED WATER BACILLUS,' 



Authority. — Adsimeiz-Wichm&nia, Die Bakterien der Nutz- und Trinkwdsser, 

 Vienna, 1888. 



"Where Found.- In water. 



Microscopic Appearance. — Long, very thin bacillus. It is not motile. 



Cultures. — 



Gelatine Plates. — Grows very slowly, forming orange red centres. Under 

 a low power they are finely granular, brown in colour, and either round or oval. 

 The depth colonies appear to be colourless. 



Gelatine Tubes. — Grows slowly on the surface, forming a slimy moist shin- 

 ing expansion of an orange red colour. No liquefaction takes place. 



Bemarks. — As far aa the above descrix^tion goes, itresembles the B. aurantiacus, 

 p. 449, but the microscopic appearance does not correspond. 



