BACILLI 481 



BACILLUS AQUATILIS GRAVEOLENS 



LIQUEFIES GELATINE | 



Authority. Tataroff, Die Dorpater Wasserbacterien, 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 Bordorii- 

 Uffreduzzi. (Eisenberg, Bakteriolog indie Diagnostic, 1891, p. 108.) 



Microscopic Appearance. Slender thin bacillus about 1-3 ^ 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 brownish yellow in colour. 

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



AGAR-AGAK. Produces a pale yellow, dry, shining expansion, which later 

 becomes of a greenish grey colour. 



GLYCEKINE-AGAR. Forms a narrow but thick grey green expansion. 



BLOOD SERUM. Produces a green white 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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