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Full text of "Pathogenic Bacteria"

346

PATHOGENIC BACTERIA.

position to occur in pairs, and not infrequently forms
chains of five or six members, so that some have been
disposed to look upon it as a streptococcus (Gamaleia).
In tlie fibrinous exudate from croupous pneumonia, in
the rusty sputum, and in the blood of rabbits and mice
containing them the organisms are arranged in pairs,
exhibit a distinct lanceolate shape, the pointed ends
generally approximated, and are usually surrounded by
a distinct halo or capsule of clear, colorless, homogeneous
material, thought by some to be a swollen cell-wall, by

FIG. 98.__Diplococcus pneumoniae, from the heart's blood of a rabbit;  x 1000

(Frankel and Pfeiffer).

others a mucus-like secretion given off by the cells. When
grown ordinarily in culture-media, and especially upon
solid media, the capsules are absent.

The organism is without motility, has no spores, and
does not seem to be able to resist any unfavorable con-
ditions when grown artificially. It stains well with the
ordinary solutions of the anilin dyes, and gives most