330 IMPORTANT VARIETIES OF FISSION-FUNGI. 



abundant formation of gas (principally C0 2 ) and moderate 

 formation of acid. 



Arkovy always found the fungus in gangrenous teeth, 

 and frequently in saliva and in gangrenous wounds 

 (decubitus). 



Zierler, like Arkovy, never failed to find the organism 

 in gangrene of the pulp (24 cases examined), those in 

 which the characteristic gangrenous odor was present. 

 Not infrequently pure cultures were obtained, and, what 

 appears especially remarkable, scarcely ever a culture of 

 any other sporulating bacillus. 



Zierler can not bring forward direct proof of the signi- 

 ficance of the organism as the cause of gangrene. Arkovy 

 has inoculated sound, broached human teeth with the 

 bacillus and thus produced gangrene. 



Further Sporulating Aerobic Varieties. 



Here are included the thermophilic varieties which were 

 spoken of from the biologic side in the general part. (See 

 p. 44.) For the characteristics of the individual varieties 

 we must refer to the original literature there cited, since 

 they have only been partly named and are without great 

 practical interest. They appear to be concerned in the 

 spontaneous heating of hay, manure, etc., also in the 

 hitherto puzzling bubbling fermentation. Laxa has 

 described an organism which belongs here (C. B. L. iv, 

 362), and Poupe (C. B. L. iv, 484) another thermophilic, 

 jelly-forming organism. 



Introduction to the Special Description 1 of the Bac. 

 tetani, Bac. Chauvcei, and Bac. cedematis maligni. 



The three varieties have in common: 



1. In pure cultures upon the usual nutrient media 

 (agar, gelatin, potato) they are more or less perfectly 

 anaerobic; on the contrary, they also grow very well 



1 In the following, free nse is made of v. Hibler's critical " Beitrage 

 zur Kenntnis der durch anaerobe Spaltpilze erzeugten Infektionser- 

 krankungen des Menschen, etc." Preliminary communication (C. B. 

 xxv, 1899, 513, etc.). The detailed work has not yet appeared (June, 

 1899). 



