484 MICRO-ORGANISMS IN WATER 



BACILLUS CONSTBICTUS 



Authority. Zimmermann, Die Baktcrien unserer Trink- und Nutzwasser, 

 insbesondere des Wasscrs dcr CJiemnitzer Wasserleitung , Chemnitz, 1890. 



Where Found. In the Chemnitz water supply. 



Microscopic Appearance. Rods with rounded ends consisting of from two 

 to six and more individual bacilli, the division between which is marked by a 

 slight constriction. The length of the shortest is about 1-5 n, whilst the long 

 rods reach to 6-5 /u. and more. They are about 0*75 ^ broad. Rotatory and 

 vibratory movement only. No spore formation observed. 



Cultures. 



GELATINE PLATES. After from four to five days the colonies appear as 

 small shining drops of a Naples-yellow colour. Under a low power the depth 

 colonies are circular discs with a serrated edge of a greyish yellow colour, with 

 granular contents. No liquefaction takes place. 



GELATINE TUBES. Forms an irregular and raised expansion of a Naples- 

 yellow colour, and grows freely in the depth. 



AGAR-AGAR. Produces a somewhat restricted thick and shining expansion, 

 Naples-yellow in colour. 



POTATOES. Forms a delicate expansion of a cadmium yellow colour. 



BACILLUS MUSCOIDES 



Authority. Liborius, ' Beitrage zur Kenntniss des Sauerstoffbediirfnisses 

 der Bacterien,' Zeitsclirift f. Hygiene, vol. i., 1886, p. 163. 



Where Found. Isolated from mice inoculated with garden soil, old cheese, 

 or cows' excrements. Found in water by Tils (loc. cit.). 



Microscopic Appearance. Bacillus about 1 AC broad ; exhibits but slight 

 inclination to form threads. Moves slowly. Forms oval-round lustrous spores 

 at the end of the rod. 



Cultures. 



GELATINE PLATES. Can only be anaerobically cultivated. Forms very deli- 

 cately finely branched colonies resembling some descriptions of moss. No 

 liquefaction takes place. 



GELATINE TUBES. Grows in the lower depths of the tube, and forms a delicately 

 branched opalescence. 



