BACILLI ^<4i2^>^ 479 



BACILLUS LACTIS VISCOSUS 



Authority. Adametz, Landwirthschaftliche Jahrbiicher, 1890, p. 185. 



Where Found. In river-water near Vienna receiving the waste water from 

 some factories. Especially in the Petersbach, where as many as from 100 to 

 200 per c.c. were detected. Also found in thick milk. 



Microscopic Appearance. Short rods, easily mistaken for slightly elongated 

 cocci ; surrounded by a capsule, which is particularly noticeable in milk 

 cultures. In this medium it is nearly as broad as long, about 1'5 fj. long and 

 1'25 ju, broad, or 1*05 /u long and 0'8 /u. broad. It gives rise sometimes to 

 filaments composed of 8 to 6 individuals (milk). In old milk cultures it gives 

 rise to involution forms resembling budding yeast-cells. It is slightly motile 

 in young cultures. 



Cultures. 



GELATINE-GLYCERINE PLATES. Forms at the end of three or four days small 

 dot-shaped colonies, which rapidly extend over the gelatine. They are irregular 

 in contour, with a serrated edge and a thick whitish centre ; the surface is 

 smooth, whilst the periphery is thin and almost transparent, with a distinct 

 opalescence. The depth colonies only grow very feebly. No liquefaction takes 

 place. 



AGAR-AGAR. Produces a narrow whitish growth, the edge of which is at first 

 smooth, but becomes later finely serrated. 



MILK. Sterilised milk becomes in four to six weeks viscous like honey, so 

 that it can be drawn out into long strings ; in unsterilised milk the cream only 

 becomes stringy, and such cream yields a white, greasy butter, which rapidly 

 spoils, owing to the numbers of the butyric acid bacillus present. Adametz 

 concludes that the B. lactis viscosus paves the way for the activity of the 

 butyric ferment. 



Remarks. It grows rapidly at 28 3 C., but only moderately well at 10 to 15 C. It 

 renders milk viscid and stringy in four weeks, due apparently to the swelling of the 

 capsules surrounding the bacillus, and not to any fermentation process. 



B. ALBUS PUTIDUS (' Fauliger weisser Bacillus ') 



! L'QUEFIES GELATINE | 



Authority. Maschek, Die Baktcricn der Nutz- und Trinkivasser, Adametz 

 Vienna, 1888. 



Where Found. In water. 



Microscopic Appearance. Small bacillus forming threads. It is motile. 

 No spore formation observed. 



Cultures. 



GELATINE PLATES. Eound white colonies, which do not extend to any dis- 

 tance over the surface. Under a low power they appear light brown in colour, 

 surrounded by a bright zone, which is about 5 mm. broad at the end of five days. 

 Liquefies the gelatine rapidly all along the path of the needle. It gives rise to 

 an intensely putrid smell. 



AGAR-AGAR. Produces an expansion, but with nothing characteristic. 



POTATOES. Grows rapidly, producing a slimy expansion. 



