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Full text of "Pathogenic Bacteria"

CHAPTER  XII.
TETRAGBNUS.

THERE can sometimes be found in the normal saliva,
more commonly in tuberculous sputum, and still more
commonly in the cavities of "tuberculosis pulmonalis, a
large micrococcus grouped in fours and known as the
Micrococcus tetragenus (Fig. 123). It was discovered by

FlG. 123.—Micrococcus tetragenus in pus from, a white mouse ; x 615 (Heim).

GafFky, and subsequently carefully studied by Koch and
GafFky. It sometimes occurs in the pus of acute ab-
scesses, and may be of importance in connection with
the pulmonary abscesses which so often complicate tu-
berculosis.

The cocci are rather large, measuring about i // in
diameter. In cultures they show no particular arrange-
ment among themselves, but in the blood and tissues of
animals they commonly appear arranged in groups of
four surrounded by a transparent gelatinous capsule.

The organism stains well by ordinary methods, and

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