476 MICRO-OKGANISMS IN WATEK 



BACILLUS CUTICULAKIS 



LIQUEFIES GELATINE | 



Authority. Tils, ' Bacteriologische Untersuchung der Freiburger Leitungs- 

 wiisser,' Zeitschrift fUr Hygiene, vol. ix., 1890, p. 316. 



Where Found. In the Freiburg water supply. 



Microscopic Appearance. Slender bacillus 0-3 to O-o /* broad, 2 to 3 /* long. 

 Forms threads in culture media. Very slightly motile. 



Cultures. 



GELATINE PLATES. Under a low power the depth colonies appear as smooth- 

 rimmed, irregular brownish discs. The surface colonies are at first smooth- 

 rimmed with a lobular periphery, yellowish brown in the centre, but colourless 

 towards the edge. The colony projects slightly above the gelatine, but after a 

 few days it sinks and the latter is quickly liquefied, whilst the colony floats on 

 the surface as a grey white pellicle. 



GELATINE TUBES. The gelatine is rapidly liquefied and a pellicle forms on 

 the surface. 



POTATOES. Grows slowly, producing at first a bright yellow and slimy 

 irregular expansion, which later becomes dark yellow. 



BROTH. - Renders it quickly turbid in the upper parts of the tube ; later the 

 whole contents become turbid, and a pellicle forms on the surface. 



BACILLUS D. (Foutin) 



Authority. Foutin, ' Bakteriologische Untersuchungen von Hagel,' Cen- 

 tralblatt fiir Bakteriologie, vol. vii., 1890, p. 373. 



Where Found. In hailstones. 



Microscopic Appearance. Bacillus about 1 ^ broad and 5 n up to 20 n long ; 

 it is thinner at the poles, which are slightly rounded. Individual bacilli contain 

 sometimes from one to four spores. The bacilli are slightly motile. They stain 

 readily with all aniline colours. 



Cultures. 



GELATINE TUBES. Forms a nail-head growth on the surface, and has a 

 granulated appearance in the depth resembling the erysipelas coccus. No 

 liquefaction takes place. 



AGAR-AGAR. Fairly abundant sharply defined growth with a mother-of-pearl 

 iridescence. 



POTATOES. A somewhat raised yellow streak restricted to the line of inocu- 

 lation, with a sharply defined edge. 



Remarks. Not pathogenic to animals. 



BACILLUS C. (Foutin) 



! LIQUEFIES GELATINE [ 



Authority. Foutin, ' Bakteriologische Untersuchungen von Hagel,' Cen- 

 tralblatt fur Bakteriologie, vol. vii., 1890, p. 373. 



Where Found. In hailstones. 



Microscopic Appearance. Slender bacillus about 1 to 2 p long, resembling 

 the B. murisepticus. Those obtained from potato cultures are rather thicker. 

 It occurs singly and in chains. Forms spores. 



Cultures. 



GELATINE PLATES. The colonies appear as white dots ; under a low power 

 they look bright yellow, transparent, with a finely serrated edge. 



GELATINE TUBES. Slowly liquefies the gelatine in a funnel-shaped depres- 

 sion ; the liquid turns a brownish red colour, and a pellicle forms on the surface. 



AGAR-AGAR. Forms a considerable pale brown and shining expansion. 



POTATOES. Grows as on agar-agar ; the colour is however stronger, and later 

 becomes dark red brown and almost black. 



Remarks. Is not pathogenic to animals. 



