TYPHOID AND COLON BACILLI. 
of Baciltus typhosus and Bacillus colt. 
145 
Some of the 
differences between them are indicated below : 
B. TyPHOsus. 
Rods usually slender. 
Flagella more numerous, longer, 
more wavy (10-20). 
In artificial media growth gener- 
ally slower and not so vigorous. 
Growth on fresh acid potato a 
nearly transparent film. 
Very slight acid production in 
ordinary media, followed sometimes 
by a production of alkali, 
Litmus milk—no change. 
Milk not coagulated. 
Fermentation of lactose 
slight if any. 
Litmus lactose agar—no change 
very 
in color. 
Glucose media—no gas forma- 
tion. 
No production of indol in ordi- 
nary bouillon. 
Does not grow in Maassen’s as- 
paragin-glycerin solution. 
Agglutination-test positive. 
B. cout. 
Rod inclined to be a little 
thicker. 
Flagella | fewer and _ shorter 
(8-10). 
Growth faster and more vigor- 
ous. 
Growth on potato a brownish 
pellicle. 
Well-marked acid production. 
Litmus milk—pink color, 
Milk coagulated. 
Fermentation of lactose pro- 
nounced. 
Litmus 
tion of red color. 
Abundant gas formation, 
lactose agar—produc- 
Well-marked indol production 
in ordinary bouillon. 
Grows in Maassen’s solution. 
Agglutination-test usually nega- 
tive. 
2. Study sections of spleen, intestinal lesions, 
mesenteric lymph-glands, 
Stain with carbol-thionin-blue 
typhoid autopsy. 
or carbol-fuchsin. 
ete., from a human 
3. Widal Reaction in Typhoid Fever.— If the 
blood-serum of a person suffering with typhoid 
fever or of one who has recently recovered from it 
