SYSTEMATIC AND DESCRIPTIVE. 215 



cocci have been isolated, which form greyish-white 

 colonies in plate-cultivations of nutrient gelatine. 

 In a test-tube of nutrient gelatine a growth results 

 chiefly on the surface ; the cultivations yield a 

 penetrating odour. 



Micrococcus pyogenes tenuis, Rosenbach. 

 Cocci, which, cultivated on agar-agar, form an 

 opaque streak in the track of the needle with 

 a transparent glassy growth extending from it. 

 Occasionally found in the pus of closed abscesses. 



Micrococcus in rabies. Cocci have been 

 described in connection with hydrophobia. The 

 cocci were observed in sections of the spinal cord 

 of rabid dogs. The descriptions given by different 

 observers* vary considerably, and it is not yet 

 ascertained whether any particular coccus is con- 

 stantly associated with the disease. Nor have 

 the organisms observed in stained' preparations 

 been cultivated apart from the diseased animal. 

 By many, however, hydrophobia is believed to be 

 due to the presence of a micro-organism, and re- 

 searches which are being carried on in connection 

 with attenuation of the virus still continue to 

 excite the keenest interest! (p. 168). 



Micrococcus of septicaemia in rabbits, 



* Hermann Fol, Academic des Sciences. 1885. Babes, Les 

 Bacteries. 1886. Dowdeswell, Journ. Royal Microscop. Soc. 

 1886. * 



t Pasteur, Comptes Rendus. 1882. Congres de Copenhague, 

 1884. Academic des Sciences. 1885, 1886. Vignal, " Report on M. 

 Pasteur's Researches on Rabies and the Treatment of Hydrophobia 

 by Preventive Inoculation," Brit. Med. Journal. 1886. 



