Bacilli Resembling the Typhoid Bacillus 657 



Liebig's extract of beef 3 grams 



Witte's peptone 10 grams 



Salt S grams 



Agar IS grams 



Water 1000 cc. 



issolve in the autoclave. Titrate as nearly as possible to the slightly 

 kaline reaction desired and then add i per cent, of Andrade's indica- 

 r which consists of 100 cc. of a 0.5 per cent, solution of acid fuchsin 

 jcolorized by the addition of 16 cc. of a normal solution of sodium 

 i^drate. After titration to the final reaction, add the sugars, and 

 aaJly o.i per cent, solution of brilliant green. 



Fig. 261. — Bacillus coli (Migula). 



Bacillus Coli (Escherich) 



Synonyms. — Bacillus coli communis; Bacterium coli; Bacillus neapolitanus. 



General Characteristics. — A motile, flagellated, non-sporogenous, aerobic and 

 iptionally anaerobic, non-chromogenic, non-liquefying, aerogenic, saprophytic, 

 iccasionaUy pathogenic baciUus, staining by the ordinary methods, but not by 

 Jram's method. It produces indol, coagulates milk, and produces acids and 

 ;ases from dextrose, lactose, and sucrose. 



This micro-organism was first isolated from human feces by 

 Emmerich,* in 1885, who thought it to be the specific cause of 

 \siatic cholera, and called it Bacillus neapolitanus. It was isolated 

 Torn the feces of infants and thoroughly studied culturally and mor- 

 ahologically by Escherich, f and has since frequently been described 

 IS "Escherich's bacillus." WeissnerJ showed that it was to be 

 found in the normal human intestme. Many have since studied it 

 iintil it has now become one of the best known bacteria, and one 



* "Deutsche med. Wochenschlrift," 1885, No 2. 

 t Die Darmbakterium des Sauglings, Stuttgart, 1886. 

 i Zeitschrift fur Hygiene, 1886, i, 315- .. 

 42 



