560 



DESCRIPTION OF SPECIES. 



and on the free surface they pro- 

 duce the appearance which has been 

 described in colonies. This micro- 

 organism is exceedingly rare. It 

 was obtained from a contaminated 

 culture. 



Monas Okenii. — Shortcylindrical 

 cells, 5 ij, wide, 8 to 16 (x long, with 

 rounded ends. They exhibit lively 

 movements, each end being provided 

 with a flagellum twice as long as 

 the cell itself. They have pale-red 

 cell-substance, with dark grains. 



They occur in stagnant water. 



Monas vinosa. — Bound or oval 

 cells of about 2-5 ji in diam., often 

 united in pairs. Their motion is 

 slow and tremulous, and the cell- 

 substance is pale-red with dark 

 grains interspersed. Flagella have 

 not been observed. 



They were found in water with 

 decaying vegetable matter. 



Monas Warmingii.— Cylindrical 

 cells, rounded at the ends, 16 ji long, 

 5 to 8 ^ broad. They are possessed 

 of a flagellum at each end, and 

 exhibit rapid, irregular movements. 

 The cell-substance is pale-red, inter- 

 spersed at the ends with dark-red 

 grains. 



Myconostoc gregarium (Cohn). 

 — The threads are very thin, colour- 

 less, unarticulated, but fall apart 

 into short cylindrical links when 

 dried. 



They form gelatinous masses, 

 10 to 17 fj. in diam., singly or 

 heaped into slimy drops on water 

 in which algse are decomposing. 



Nitromonas of Winogradsky. — 

 Very short rods, '9 to 1 ji in width, 

 1-1 to 1-8 ju. in length. Singly, in 

 masses, and in very short chains. 



They can be cultivated in silica- 

 jelly. 



They are active agents of nitrifi- 

 cation . 



They were obtained from the soil. 



Pediococcus acidi lactici 

 (Lindner). — Cocci -6 to 1 /x in diam., 

 singly, in pairs, and tetrads. 



Colonies colourless. 



On the surface of agar the cocci 

 form a colourless layer. 



On potato the growth is almost 

 invisible. 



The cocci produce lactic acid in 

 solutions containing sugar. 



They occur in hay infusion and 

 malt. 



Pediococcus cerevisiaa (Balcke). 

 — Cocci singly, in pairs, and tetrads. 



Colonies at first colourless, later 

 yellowish-brown. 



Inoculated in the depth of gela- 

 tine a greyish-white filament 

 occurs in the track of the needle, 

 and a white layer on the free 

 surface. 



On agar the growth is transparent 

 and iridescent, and on potato almost 

 invisible. 



They were isolated from the air 

 of a brewery. 



Pneumobacillus liquefaciens 

 bovis (p. 242). 



Proteus capsulatus septicus 

 (Bauti). — Rods isolated from a case 

 of septicaemia, and identical with 

 Proteus hominis capsulatus. 



Proteus hominis capsulatus 

 (p. 224). 



Proteus in gangrene of the 

 lung (Babfes). — Rods -8 to 1-5 ^ 

 thick, irregular in form, and fila- 

 ments with irregular enlargements. 



Colonies whitish and transparent, 

 with ramifications extending over 

 the gelatine. 



In the depth of gelatine a growth 

 occurs along the track of the 

 needle, and a ramifying grow^th on 

 the free surface. 



On agar the growth is slightly 

 yellowish. 



On potato the growth is brownish. 



They are extremely pathogenic 

 in mice and guinea-pigs. 



They were isolated from a case 

 of gangrene of the lung. 



Proteus microsepticus (Kar- 

 linski). — Cocci, rods and filaments 

 in morphology, and cultures re- 

 sembling Proteus vulgaris. 



Inoculated in the depth of gela- 

 tine liquefaction occurs in the 

 track of the needle, forming a 

 funnel with cloudy contents, and 

 in a few days the whole of the 

 gelatine is liquid. 



They produce a general infection 

 in mice, and death in twenty-four 

 hours, and occasionally death in 



