BACILLI 481- 



BACILLUS AQUATILIS GEAVEOLENS 



LIGHJEFIES GELATINE 



Authority.— Tataroff, Die Dorpater Wasserbacterieri, Dorpat, 1891, p. 48. 



"Where Found. — In Dorpat water. It has many points of resemblance with 

 the B. graveolens isolated from between the teeth, and described by Bordoui- 

 Uffreduzzi. (Eisenberg, BaMeriologische Diagnostik, 1891, p. 108.) 



Microscopic Appearance. — Slender thin bacillus about 1-3 ju long. On 

 potatoes short bent threads are visible. Slightly motile. 



Cultures. — 



Gelatine Plates. — Circular colonies having a yellowish centre and grey 

 periphery. Under a low power the surface colonies are pale yellow and mul- 

 berry-shaped ; later, when liquefaction commences, they become dark yellow, 

 and the periphery becomes encircled by a grey and undefined ' Schwarmzone.' 

 In the depth they appear circular, pale yellow, and mulberry-shaped. 



Gelatine Tubes. — A greenish yellow round basin appears on the surface, 

 which soon, without increasing in size, sinks into the gelatine, forming a fun- 

 nel-shaped depression. The liquefaction is rapid, and a dirty yellow pellicle 

 forms on the surface, whilst the gelatine becomes bro^vnish yellow in colour. 

 The cultures have a penetrating odour resembling the perspiration from feet. 



Agab-agar. — Produces a pale yellow, dry, shining expansion, which later 

 becomes of a greenish grey colour. 



Glycebine-agae. — Forms a narrow but thick grey green expansion. 



Blood Serum. — Produces a ^'een w^hite streak, at the lower end of which a 

 drop forms. Later a delicate grey white serrated pellicle forms over the streak, 

 at the bottom of which grey white shreds collect. Finally the serum becomes 

 a gelatinous mass, in which the pellicle remains suspended. 



Broth. — The liquid becomes turbid, and a green white deposit is formed. 



Potatoes.— Thin and grey white somewhat restricted growth, which later, 

 especially at higher temperatures, becomes covered with little bubbles of gas. 

 The potato itself turns a greyish blue colour. 



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