DESCRIPTION OF SPECIES. 



573 



Streptothrix asteroides 



{ Ooxpora asteroides, Sauvageau 

 and Radais ; Cladothrix asteroides, 

 Eppinger). Branching filaments 

 which form on the surface of 

 grape-sugar-agar a whitish growth, 

 which is later of a brownish-yellow 

 colour. 



Broth remains clear, and small 

 pellicles float on the surface re- 

 sembling drops of stearin. 



On potato they form snow-white 

 points, which turn brick-red in 

 colour, and are later covered with 

 a delicate white efflorescence. 



The streptothrix is pathogenic 

 in rabbits and guinea-pigs. 



It was isolated from pus. 



Streptothrix aurantiaca 

 (Oospora aurantiaca, Sauvageau and 

 Radais, and Doria). Similar to 

 Streptothrix asteroides. 



Streptothrix carnea (Doria; 

 Oospora carnea, Sauvageau and 

 Radais). Similar to Streptothrix 

 asteroides, but the cultures on 

 gelatine are pink. 



They are not pathogenic. 



Streptothrix chromogenes 

 (Gasparini ; Oospora chromogenes, 

 Lehmann and Neumann). Culti- 

 vated on the surface of gelatine the 

 filaments produce a chalky growth, 

 and the jelly is coloured brown, and 

 is slowly liquefied. 



i On potato the growth is yellowish 

 or brown, and the potato itself is 

 coloured dark brown or black. 



The streptothrix has been isolated 

 from air and water and the con- 

 tents of the stomach. 



Streptothrix farcinica (Bacille 

 du farcin de bceuf, Nocard ; Oospora 

 facinica, Sauvageau and Radais). 



Inoculated on the surface of 

 gelatine there is in about two weeks 

 a very scanty granular growth. 



In broth greyish pellicles develop 

 with a dusty surface. They are 

 pathogenic in cattle, guinea-pigs, 

 and sheep. 



They were isolated from the 

 disease known as farcin de bceuf. 



Streptothrix Forsteri (Cohn). 

 Cocci rods, and leptothrix threads. 

 The threads are twisted in irregular 

 spirals, and branch sparingly and 



irregularly. Screw-forms are pro- 

 duced by the threads breaking up 

 into small pieces. 



Colonies slowly liquefy gelatine. 

 On agar they form a whitish 

 growth. 



In broth they form shining 

 masses, floating in clear liquid. 



They occur in the lachrymal 

 canals of the human eye, in the 

 form of closely felted masses, and 

 in the air, and in fresh- and sea- 

 water. 



Streptothrix Hofmanni (Micro- 

 myces Hoffmanni, Gruber ; Oospora 

 Hoffmanni, Sauvageau and Radais). 

 The filaments flourish in the ordin- 

 ary culture media with the addition 

 of sugar, but they do not grow on 

 potato. 



They produce suppuration in 

 rabbits. 



They were isolated from the air. 

 Streptothrix liquefaciens 

 (Cladothrix liquefaciens, Garten). 

 A variety of Actinomyces bovis. 

 Streptothrix madurae (p. 449). 

 Streptothrix musculorum 

 SUis (Actinomyces suis, Bunker). 

 A variety of actinomyces found 

 in the muscles of swine. 



Streptothrix odorif era (Oospora 

 odor if era, Rullmann). Probably 

 identical with Oospora chromogenes. 

 Streptothrix violacea (Oospora 

 violacea, Sauvageau and Radais, 

 and Doria. This streptothrix 

 liquefies gelatine, and gives it a 

 pale wine-red colour. 



Agar is coloured a violet tint, 

 and potato becomes a reddish- 

 brown. 



Urobacillus Dnclauxi 

 (Miquel). Rods '6 to -8 p in 

 diam., and filaments 2 to 10 /* in 

 length. Motile. Spore-formation 

 present. 



In gelatine containing ammonia 

 or urea they develop in the track 

 of the needle and cause liquefac- 

 tion. The liquefied gelatine is 

 viscid. 



Broth containing ammonia be- 

 comes turbid, a sediment forms, and 

 the liquid gives off an unpleasant 

 odour. 



They occur in sewage. 



