928 



SCHIZOMYCETES 



Classification. — This is difficult, and perhaps should not be carried 

 further than groups which may be recognized as follows: — 



Diagnostic Table of Streptococcal Groups. 



A. Parasitic on plants. Grow in broth but not on agar or gelatine— J. Sphagni 



group. 



B. Parasitic in animals. Grow in broth and on agar and usually on gelatine : — 



I. Obligatory anaerobes — //. Fcetidus group. 

 II. Aerobes, facultative anaerobes: — 



{a) Pigment present — III. Sanguineus group. 

 (6) Pigment absent : — • 



1. Gelatine actively liquefied — IV . Gracilis group. 



2. Gelatine usually not or rarely slightly liquefied, inulin usually 



not fermented: — 



(a) Gas produced — V. Gasogenous group. 



(b) Gas not produced : — 

 Non-Fermenters : — 



{a) Glucose and other sugar media not fermented — 



VI. Non-fermenting group. 

 Monosaccharide Fermenters — Equine FcBcal Type : — • 



(&) Glucose usually and other sugar media generally 

 fermented. 



1. Glucose alone or with saccharose and salicin, but 



not with lactose, fermented — VII. Equine group. 

 Disaccharide Fermenters — Human Fcscal Type : — 



2. Lactose, glucose, saccharose, and salicin, but not 



mannitol fermented— F J//. Ery sip elatos group. 



3. Lactose, glucose, saccharose, salicin, mannitol, and 



sometimes raffinose fermented — IX. Fcecalis 

 group. 



Trisaccharide Fermenters — Bovine Fcscal Type : — 



4. Rafhnose, lactose, saccharose, usually glucose some- 



times salicin and rarely inulin, but not mannitol 

 fermented — X. Salivarius group. 



If desired the investigation can be extended, but in our experience 

 only Groups 11. , VIL, VIIL, IX., and X. are of tropical import- 

 ance, and therefore we shall limit our remarks to them : — 



IL Fcetidus Group. 

 Definition. — Streptococcus parasitic in animals, obligatory anae- 

 robes growing well at 37° C, and poorly or not at all at 20° C. :— 



I. Foetid gas produced; milk usually acidified and slowly clotted — 

 5. fcetidus. 



II. Foetid gas not produced; milk unchanged — S. anaerobius. 

 Both these organisms have been known to cause puerperal fever. 



VII. Equine Group. 



Definition. — Streptococcus parasitic in animals, aerobe facultative 

 anaerobe, without pigment, not liquefying gelatine nor producing 

 gas, and being a monosaccharide fermenter. Glucose, salicin, and 

 usually saccharose, are fermented, but not lactose, and with feeble 

 or no growth at 20° C. Milk not clotted. 



