BACILLI 447 



BACILLUS SUBFLAVUS 



Authority. Zimmermann, Die Bakterien unserer T/ink- und Nutzwasser, 

 insbesondere dcs Wassers der Chemnitzer Wasserleitung, Chemnitz, 1890. 



Where Found. In the Chemnitz water supply. 



Microscopic Appearance. Bacilli, with rounded ends, about 0-77 /* broad 

 and from 1-5 to B'O p long, consisting of several individuals hanging together. 

 Slow motility. 



Cultures. 



GELATINE PLATES. Forms small yellowish white dots in the depth. On 

 reaching the surface the colony resembles a yellowish white shining drop, 

 which soon becomes a flat expansion with an irregular and lobular periphery. 

 Under a low power the surface appears lineally arranged in scales, and has a 

 mother-of-pearl iridescence which later becomes dirty pale yellow. No lique- 

 faction takes place. 



GELATINE TUBES. Forms a delicate greyish yellow expansion round the 

 point of inoculation, the edge being finely serrated. 



AGAB-ACIAB. Forms a pale yellow expansion, which later becomes darker 

 and gradually covers the whole surface. Later the colour inclines to light 

 chrome-yellow and yellow ochre. 



POTATOES. Does not grow very abundantly, and produces a faint loamy 

 yellow colour. 



BACILLUS TBEMELLOIDES 



LIQUEFIES GELATINE j 



Authority. Schot^elius. Quoted by Tils, ' Bacteriologische Untersuchun- 

 gen der Freiburger Leitungswasser,' Zeitschrift f. Hygiene, vol. ix., 1890, 

 p. 315. 



Where Found. In Freiburg water, by Tils. 



Microscopic Appearance. Small bacillus about 0-75 to 1 /* long and 0-25^ 

 broad, with rounded ends. It is motile. 



Cultures. 



GELATINE PLATES. Forms smooth-rimmed yellow dot colonies in the depth, 

 whilst on the surface it forms small yellow projections, which later extend on 

 all sides. Under a low power the rim is smooth, but irregularly lobular. The 

 colony consists of small isolated heaps of bacilli, which are gathered together in 

 aggregates. 



GELATINE TUBES. Along the needle's path in the depth innumerable small 

 isolated colonies of a yellow or yellowish brown colour are gathered together. 

 On the surface a growth appears resembling a surface plate-colony, and after 

 from eight to ten days the colony gradually sinks and the gelatine becomes thick 

 and fluid. 



AGAB-AGAB. Forms a dry granular growth along the needle's path on the 

 surface. After several days it becomes surrounded with a slimy yellow and 

 shining periphery. 



POTATOES. Produces a coarsely granular, crumbly yellow protuberance. 

 After fourteen days the* growth has sunk somewhat, and is surrounded with a 

 slimy periphery. 



Remarks. It is aerobic. 



