The
souring of milk succeeds the multiplication of these germs. Certain
varieties are pigmented, and we observe colonies of chromogenic cocci
multiplying upon slices of boiled potato, eggs, etc., presenting all
the colors of the rainbow. All of these germs are not the cause of
disease. Certain species, however (termed pathogenic), are always
associated with certain diseased conditions.
The _bacteria-termo_--micro-bacteria--are slightly elongated, and
inasmuch as they multiply by division, frequently appear coupled
together, linked in pairs, and in chains. They are generally found in
putrefying liquids, especially infusions of vegetable matter. They
possess mobility to a remarkable degree. Observing a field of
bacteria-termo under the microscope, they may be seen actively engaged
in twining and twisting. A flagellum has been demonstrated as attached
to one or both extremities. This is too minute to be generally
resolved, even if it is a common appendage.
_Desmo-bacteria_ (or bacilli) are rod-like organisms, occurring of
various lengths and different thicknesses. In a slide of the bacillus
of tuberculosis and anthrax, we notice at intervals dots which
represent the spores from which, as the rods break up, future bacilli
are developed.
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