BACILLI 463 



BACILLUS MESENTERICUS PUSCUS 



LIQUEFIES GELATINE I 



Authority. Fliigge, Die Uikroorganismen, 1880, p. 321. 



Where Found. - In air, in hay dust, on potato rinds, and frequently in 

 water. 



Microscopic Appearance. Short bacillus, occurring in twos and fours. It 

 is very motile. Forms small shining spores. 



Cultures. 



GELATINE PLATES. Forms round white centres, which under a low power 

 are brownish yellow in colour, finely granular, and smooth-rimmed. Later 

 the rim exhibits delicate thread-like projections. The gelatine is rapidly 

 liquefied. 



GELATINE TUBES. Forms a liquid funnel-shaped depression, whilst the 

 needle's path in the depth is marked by a cloudy whitish appearance. In four 

 to six days the liquefaction has extended right across the tube, and the liquid 

 becomes filled with greyish flocculent particles. 



POTATOES. Forms a smooth yellow expansion, which rapidly becomes 

 wrinkled, furrowed, and brown. The growth is thin and does not penetrate 

 any distance into the substance of the potato, but it extends over the whole 

 surface. 



BACILLUS MESENTERICUS YULGATUS 



( ' Potato Bacillus ') 



LIQUEFIES GELATINE 



Authority. Eisenberg (Bakteriologischc Diagnostic, 1891, p. 117) con- 

 siders the so-called ' Kartoffel bacillus ' as identical with the above. 



Where Found. On potatoes, in milk, and in water, by Tils (loc. cit.) and 

 other investigators. 



Microscopic Appearance. Small fat bacillus with rounded ends, in pairs, 

 and often forming threads of four individuals. When cultivated on gelatine 

 and agar-agar, the poles stain better than the middle of the bacillus. It is 

 very motile. Forms large oval spores which occupy the whole interior of the 

 bacillus. 



Cultures.- - 



GELATINE PLATES. Forms circular yellowish colonies, which rapidly liquefy 

 the gelatine. 



GELATINE TUBES. Liquefies the gelatine rapidly all along the needle's path 

 in the shape of a pointed funnel ; the remainder of the contents quickly 

 become fluid, and a pellicle forms on the surface. 



AGAR-AGAR. Produces a dirty white expansion. 



POTATOES. Grows rapidly, forming at first a moist expansion, which later 

 becomes wrinkled and furrowed. The growth is tough and stringy. 



