562 



DESCRIPTION OF SPECIES. 



•63 fi wide. They are actively 

 motile. 



Cultivated on nutrient gelatine 

 they convert it into a turbid, grey- 

 ish-white liquid. If cultivated in 

 a capsule containing 5 per cent, of 

 nutrient gelatine, a few hours after 

 inoculation the most characteristic 

 movements of the individual bacilli 



Fig. 223. — Pkotkus Vulqaeis, i'bom 



SUEKAOE OF NlJTKIENT GrjELATINE, >< 



(Hausbr). 



are observed on the surface of the 

 nutrient gelatine, although at this 

 early stage no superficial liquefac- 

 tion can be detected. Probably the 

 movements depend upon the exist- 

 ence of a thin liquid layer, as they 

 are not observed if the nutrient 

 medium contains 10 per cent, of 

 gelatine. 



They were isolated from putrid 

 meat infusion. 



Proteus Zenker!.— Cocci -4 fi, in 

 twos like Bacterium termo, and 

 short rods 165 fi long. 



Cultivated on nutrient gelatine 

 no liquefaction results, but a thick 

 whitish-grey layer is formed. The 



bacilli are motile, and the same 

 phenomena are observed on the 

 solid medium as in Proteus vulgaris. 

 In cover-glass impressions most 

 varied groupings of the bacilli are 

 seen, and also developmental and 

 involution-forms. 



They were isolated from putrid 

 meat infusion. 



Pseudo-diphtheritic bacil- 

 lus (p. 335). 



Pseudo-diplococcus pneu- 

 moniaB (Bonome). — Oval cocci 

 in pairs and short chains ; oap- 

 sulated. 



Inoculated in the depth of 

 gelatine small colonies develop 

 in the track of the needle in 

 twenty-four hours. 



On agar there is a scanty,. 

 moist growth. 



On potato an almost in- 

 visible film. 



In broth the cocci grow 

 rapidly, and the cultures give 

 ofE a peculiar odour. 



They produce septicaemia in 

 mice, guinea-pigs and rabbits. 



This micro-organism is 

 probably a variety of the 

 pneumococcus. 



They were isolated from a 

 fatal case of cerebro-spinal 

 meningitis. 



Rhahdomonas rosea. — 

 Spindle-form rods, 38 to 5 /u. 

 broad, 20 to 30 fi long. They 

 exhibit slow, trembling move- 

 ments, having at each end of 

 the cell a flagellum. The 

 cell-substance is very pale, with 

 dark grains interspersed. 



They occur in brackish water. 

 S a r c i n a alba. — Small cocci. 

 They form small white colonies on 

 nutrient gelatine. 



Inoculated in the depth of gela- 

 tine they grow slightly along the 

 needle track, but are heaped up pn 

 the surface without liquefying the 

 gelatine. 



They are present in the air. 

 S arc in a aurantiaca.— Cocci 

 singly, in pairs, in tetrads, and in 

 packets. 



Colonies orange-yellow. 

 Inoculated in the depth of 



THE 



285 



