THE CLASSIFICATION OF BACTERIA 361 



* Gelatin liquefied very slowly or imperfectly. 



7. Streptothrix Rosenbachii Kruse. 

 ** Gelatin liquefied rather rapidly. 



8 . Streptothrix invulnerabilis ( Acosta-Grande-Rossi) Kruse. 



9. Streptothrix Foersteri Cohn. 



b. Chromogenic ; produce pigment on gelatin. 



* Gelatin colonies yellowish. 



10. Streptothrix albido Rossi-Doria. 

 ** Gelatin colonies brownish ; gelatin stained a deep brown. 



u. Streptothrix chromogena Gasperini. 

 *** Gelatin colonies violet. 



1 2 . Streptothrix violacea Rossi-Doria . 



**** Gelatin colonies, grown anaerobically, brick-red. 



13. Streptothrix rubr a Kruse. 

 2. Gelatin not liquefied. 



a. No distinct pigment on gelatin or agar ; growth white gray, 



or at most, yellowish white. 



14. Streptothrix far cinica (Trevisan) Rossi-Doria. 



b. Chromogenic ; a pigment on gelatin or agar. 



* On gelatin, colonies or growth yellowish orange. 



15. Streptothrix aurantiaca Rossi-Doria. 



1 6 . Streptothrix aster oides ( E ppi nger ) . 



** On gelatin or agar, colonies or growths become reddish. 



17. Streptothrix carnea Rossi-Doria. 



1 8. Streptothrix inadurce Vincent. 



i. Streptothrix bovis (Harz) 



Actinomyces bovis Harz: Jahresb. Munch. Central Thierarzneischule, 1877-78. 

 Discomyces bovis Rivolta : Sul. cosi detto mal del rospo della Trutta e sul' Actinomyces 

 bovis di Harz, 1878. 



Morphology. In the body of man and animals, as foci of granulation tissue, 

 containing the fungus, which is composed of interlacing filaments, and 

 which on the periphery show a radial arrangement or clavate enlargement 

 of their ends. Filaments 0.4-0.6 /n in diameter, either long and unseg- 

 mented, or breaking up into longer or shorter rods. The filaments often 

 show a segmentation of their plasma and the formation of gonidial ele- 

 ments, which later are set free and are presumably gonidia. In cultures, 

 filaments showing true branching are numerous. The clavate enlarge- 

 ments of the ends of the filaments, due to a capsular thickening, are 



