494 MICRO-ORGANISMS IN WATER 



MICEOCOCCUS PLUMOSUS 



Authority. — BmutigamyDie Bakterien derNutz- und rrw^wasser, Adametz. 

 Vienna, 1888. 



"Where Found.— In water. 



Microscopic Appearance.^Kound cocci 08 fi in diameter, forming zooglcea. 

 Not motile. 



Cultures. — 



Gelatine Plates. — Forms tongue-shaped yellowish white colonies, the edges 

 of which are generally raised like a rampart above the surface of the gelatine. 

 No liquefaction takes place. 



Gelatine Tubes. — Forms on the surface a slimy expansion, from which 

 ramify delicate white extensions, resembling crystal needles. In the depth 

 similar extensions are visible along the needle's path ; these ramifications con- 

 sist of beaded strings of colonies. 



Potatoes. — Forms a yellowish white irregular expansion, with tongue- 

 shaped projections. 



MICEOCOCCUS AQUATILIS 



Authority. — Bolton, 'Ueber das Yerhalten verschiedener Bacterienarten 

 im Trinkwasser,' Zeitschrift f. Hygiene, vol. i., 1886, p. 94. 



Where Found. — Very frequently in water. 



Microscopic Appearance. —Very small cocci, gathered together in groups. 



Cultures. — 



Gelatine Plates. — Forms circular, porcelain-white, smooth, and slightly 

 raised colonies. Under a low power the depth colonies are roundish, with a 

 rough denticulated edge, and resemble a mulberry in shape, and are of a light 

 yellow colour. The surface colonies are circular and smooth-rimmed ; the 

 centre is dark, and numerous furrows extend from it, enclosing small rhombic 

 irregular spaces. No liquefaction takes place. 



Gelatine Tubes. — Grows on the surface and along the needle's path in the 

 depth, producing a white growth. 



Agak-agar. — Forms a white expansion. 



PEDIOCOCCUS ALBUS 



LIQUEFIES GELATINE 



Authority. — Lindner, Die Sarcine-orcjanismen der Gdritngsgewerhe, Ber- 

 lin, 1888. 



Where Found. — In well-water. 



Microscopic Appearance. — Cocci arranged as diplococci and in tetrads. 

 It does not exhibit the typical sarcina form, but occurs frequently in a pseudo- 

 sarcina form, when the tetrads lying close together become pushed one on the 

 top of the other. 



Cultures.— 



Gelatine Plates. — Eapid liquefaction of the gelatine takes place, the ball- 

 shaped colony sinking to the bottom and forming later an irregular flocculent 

 mass. 



Gelatine Tubes. — In twenty-four hours the whole length of the needle's 

 path in the depth is liquefied, and at the bottom of the canal a white flocculent 

 sediment collects, which on the fourth day assumes a faint orange tone. 



Agar-agak.— Forms a broad and dry expansion, which later becomes orange- 

 coloured. 



Potatoes.— Forms a dirty white cake-like expansion. 



Remarks. — In culture fluids it rapidly forms a pellicle. It grows best at 20° to 25° 

 C, but will alrto develop at 40° C. It will withstand au exposure of twelve minutes 

 to 50° to 55° C, but an exposure to G0° C. for eight minutes destroys it. 



