480 MICRO-ORGANISMS IN WATER 



'WHITE BACILLUS' (Maschek) 



| LIQUEFIES GELATINE | 



Authority. Maschek, Die Baktcrien derNutz-und Trinkwcisser, Adametz,, 

 Vienna, 1888. 



Where Found. In water. 



Microscopic Appearance. Short bacillus with rounded ends. 



Cultures 



GELATINE PLATES. Circular colonies with a white centre. Under a low 

 power they look bright yellow. The gelatine is liquefied in three days. 



GELATINE TUBES. Forms a funnel-shaped depression already after two 

 days, and at the end of four days the whole of the gelatine is liquid. 



AGAR-AGAR. Grows rapidly, without any characteristic appearance. 



POTATOES. Produces a white expansion, which later (four weeks) becomes- 

 brown in colour. 



BACILLUS CRASSUS AROMATICUS 



| LIQUEFIES GELATINE f 



Authority. Tataroff, Die Dorpater Wasscrbacterien, Dorpat, 1891. 



Where Found. In well-water in Dorpat. 



Microscopic Appearance. Fat double bacillus having a distinct compres- 

 sion, 3*5 to 5-0 fj. long and 1'5 /j. wide, with rounded ends. The poles stain more 

 strongly than the centre. Produces also variously bent, and also long threads. 

 Gives rise to round spores on agar-agar cultures. 



Cultures. 



GELATINE PLATES. Forms cup-shaped liquefying colonies in the centre, 

 at the bottom of which is seen a small white pellicle, somewhat resembling a 

 rosette in appearance, surrounded by a greyish round circle with radial streaks. 

 With a low power the depth colonies are yellow brown discs, with fine granular 

 contents ; the periphery is broken up into large rounded lappets, resembling the 

 petals of a flower. The surface colonies are yellow brown in the centre, and 

 are filled with granular contents ; the edge is paler in colour, and is not at first 

 easily distinguished from the adjacent gelatine; but later the periphery exhibits 

 short and fine hairy extensions. 



GELATINE TUBES.- -Produces a circular white expansion, greyish in colour 

 towards the edge, which has a radially streaked appearance. The liquefaction 

 proceeds rapidly in a funnel-shaped depression, and a white pellicle forms on 

 the surface which later on sinks to the bottom. A dirty white deposit is 

 produced, and a fresh pellicle is formed on the surface. 



AGAR-AGAR AND GLYCERINE-AGAR. Forms a white shining slimy and thin 

 expansion, and a white deposit. 



BLOOP SERUM. Produces a narrow milk-like streak, at the bottom of which 

 drops collect, which gradually sink down into the condensed water at the 

 bottom of the tube ; but they remain isolated, and do not combine either with 

 the water or each other. 



BROTH. Eenders it turbid, with a dirty white deposit. 



POTATOES. A light brown smooth and shining growth soon covers the 

 whole surface. 



Remarks* The above name is given to this organism on account of the fatness- 

 of the bacilli and the fruit-like odour given off by the gelatine-plate cultures. 



