DESCRIPTION OF SPECIES. 



571 



to, if not identical with, Strepto- 

 coccus pyogenes bovis(Crookshank). 

 Streptococcus in progressive 

 tissue necrosis in mice.— Koch 

 produced a disease in mice by sub- 

 cutaneous injection of putrid blood. 

 In tissue sections a chain coccus 

 was found which was similar to 

 Streptococcus pyogenes. 



Jig. 229. — Stkeptococcus in Pro- 

 GKESsivE Tissue Necrosis in Mice. 

 a. Necrotic cartilage cells, and (6) 

 chains in masses ; o, isolated chains. 

 (Koch.) 



Streptococcus in Strangles 

 (Sohutz). — Cocci forming long 

 ■chains, which, it is said, do not grow 

 on nutrient gelatine or agar, but 

 form a transparent iridescent cul- 

 ture on blood serum. Cultures in 

 hrpth produced the disease in horses 

 and mice. Rabbits, guinea-pigs, 

 and pigeons are not affected. ' 



Strangles is a disease of the horse, 

 associated with suppuration of the 

 glands of the head and neck, prin- 

 -cipally in the sub-maxillary, sub- 

 parotideal, and retro-pharyngeal 

 regions. Schutz found that the pus 

 contains streptococci and produces 

 a fatal disease in mice. 



Streptococcus liquefaciens 

 (Sternberg). — Spherical and oval 



cocci, -4 to -6 fi in diam., singly, in 

 pairs and short chains. 



Inoculated in the depth of gela- 

 tine liquefaction occurs rapidly in 

 the track of the needle, and in a 

 week the gelatine is completely 

 liquefied, shghtly opalescent, and a 

 scanty deposit forms at the bottom 

 of the tube. 



In the depth of agar a filament 

 is formed composed of closely- 

 crowded colonies. 



On potato a thin and limited 

 dry white layer is formed along the 

 line of inoculation in four to five 

 days. 



They are non-pathogenic. 

 They were isolated from the liver 

 and intestines of fatal cases of 

 yellow fever. 



Streptococcus mirahilis (Ros- 

 coe and Lunt). — Cocci 4 /i in diam., 

 singly, and in long chains. 



The growth on nutrient media is 

 very scanty. 



In broth the growth is composed 

 of a mass of delicate ^laments 

 which collect at -the bottom of the 

 liquid. 



They were isolated from sewage. 

 Streptococcus of Bonome.— 

 Cocci forming chains. They corre- 

 spond in description with Strepto- 

 coccus pyogenes, but, it is said, 

 they do not grow in gelatine or 

 on blood-serum, and they are said 

 to be distinguished by the characters 

 of the colonies on agar plates. 

 They are pathogenic. 

 Inoculated in rabbits and white 

 mice they produce symptoms 

 similar to those produced by in- 

 oculations of the pneumococcus. 

 Sub-cultures rapidly lose their 

 virulence. 



They were isolated from cases 

 of cerebro-spinal meningitis. 



Streptococcus of Manneberg — 

 Cocci ■§ /i in diam., singly, in pairs, 

 and in chains. 



Inoculated in the depth of gela- 

 tine a white filament forms along 

 the track of the needle composed 

 of minute colonies. In about a 

 month the filament is replaced by 

 a funnel of semi-liquefied gelatine. 

 On the surface of agar the 



