BACTEROIDEm 



959 



TRIBE BACTEROIDEM Castellani and Chalmers. 



Definition. — Bacillaceae with good growth on ordinary laboratory media, 

 without endospores, fluorescence, or pigrnent formation, and obligatory 

 anaerobes. 



Type Genus. — Bacteroides Castellani and Chalmers, 191 8. 



Genus Bacteroides Castellani and Chalmers, igi8. 



Definition. — Bacteroideae with the tribal characters. 

 Type Species. — Bacteroides fragilis Veillon and Zuber. 



The type is found in abscesses from various parts of the body. Another 

 species is the well-known Bacteroides ftisiformis of Le Dantec and Vincent, 

 found in hospital gangrene, and in Vincent's angina and many other conditions, 

 as well as in the mouths of healthy persons and in the tartar on teeth. 

 Some of the intestinal forms are given on p. 960. 



TRIBE BACILLEM Castellani and Chalmers, 191 8. 



Definition. — Bacillaceae growing well on ordinary laboratory media and 

 possessing endospores. 



Type Genus. — Bacillus Cohn, 1872, pro parte. 



Genus Bacillus Cohn, 1872. 



Definition. — Bacilleae with the tribal characters. 

 Type Species. — Bacillus suhtilis (Ehrenberg, 1833). 



Classification. — The genus may be divided into two groups as follows: — 



A. Aerobes — Suhtilis group. 



B. Obligatory anaerobes — Tetanus group. 



Only the lattervconcerns us at present. 



Tetanus Group. 



The group may be divided into subgroups as follows : — ■ 



A. Gelatine liquefied:— 



I. Inspissated blood serum not liquefied: — • 



(a) Little or no gas in milk; white of egg not sensibly affected. 



Usually motile — Subgroup Quarter Evil, 

 {b) Much gas in milk; white of egg slightly affected. Usually 

 non-motile — Subgroup Saccharolytic. 

 II. Inspissated blood serum liquefied : — 



White of egg digested — Subgroup Proteolytic. 



B. Gelatine not liquefied: — 



Inspissated blood serum not liquefied. White of egg not digested 

 — Subgroup Non-liquef active. 



Subgroup Quarter Evil. 



Synonym. — Rauschbrand group. 



Definition. — Tetanus group usually motile, liquefying gelatine, non-proteo- 

 lytic, and do not liquefy inspissated blood serum. Clotting milk without 

 much shrinkage. Citron and bladder forms occur. Spores usually central. 



Classification. — The organisms of this group may be recognized as follows *• — 



A. Long threads present— Fi&n'ow septique. 



B. Long threads absent : — 



I. Saccharose fermented — Feseri. 

 II. Saccharose not fermented : — 



{a) Spores rare in animals — Novyi. 



[b) Oval end spores present — End-sparing types. 



