CLASSIFICATION OF THE BACTERIA. 91 



B. of septicaemia of mice, Koch. 



Extremely minute bacilli .8 to 1 p, long, and 

 .1 to .2fM thick, solitary or in short chains; found 

 chiefly in the white blood-corpuscles of septicse- 

 mic mice. (See Fig. 19, p. 353.) 



B. of cholera, Koch. 



Found in the rice-water discharges of cholera 

 patients, and within the mucous membrane and 

 tubular glands of those dead of this disease. 

 The bacilli are described as comma-shaped, mo- 

 bile organisms, which occur in wavy masses, and 

 form characteristic colonies in gelatine cultures. 



g. Leptothrix, Ktz. 



The Leptothrix differ from Bacilli by their fila- 

 ments being very long, adherent, very slender, and 

 indistinctly articulated. Numerous species have been 

 described. 



g. Beggiatoa, Trev. 



Filaments very slender, surrounded by mucous 

 matter, rigid, having oscillatory movements. Proto- 

 plasm white, enclosing numerous granules, which 

 recent observations have demonstrated to be crystal- 

 line sulphur (Cramer, Cohn). 



4. SPIROBACTERIA. 



This tribe includes the bacteria with undulating 

 filaments, or filaments in spirals, more or less de- 



