198 MICROBES, FERMENTS, AND MOULDS. 
are full of motion and activity, which they retain for 
some time. They are arched in form, and, roughly 
speaking, resemble a comma. Their length is 1} micro- 
millimetres to 24 micro-millimetres, and their width is 
0°6 to 0-7 micro-millimetre. They are often arranged 
in chains or chaplets, so as to appear like the letter 8S, 
or several S’s, placed end, to end as we see in Fig. 87. 
These latter are the most characteristic. Compared 
TNS earn he Brosh aoe cvion lina sella Qrewelp Magalies ie ealvates 
of bacillus, under a simple lens. 
with the microbe of tuberculosis, that of cholera is 
shorter and thicker. Its spiral shape has led to the 
belief that it is an intermediate form between the 
genera Bacillus and Spirillum. 
Comma-shaped microbes may be found in most 
stagnant and running water, but they are in general 
much larger, and none of them present the charac- 
teristic dimensions of Bacillus komma. 
This bacillus is found in the riziform grains of 
choleraic evacuations, which are, as we know, formed 
