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NUTRIENT MEDIA FOR BACTERIA IN THE ORAL CAVITY. 43
ular, many-sided cells, which are frequently covered with bac-
teria, especially in vitiated or spoiled saliva (Fig. 9). The fact
that these cells are often found in a state of partial destruction
by bacteria would seem
to indicate that they form FiQ 9.
a not unfavorable nutrient
for certain kinds at least,
a view which is also sup-
ported by the chemical
^^^j^V '., *j^(^ ifTo-^.'-" '^<'^r%»
analysis.

4. Tooth-Cartilage.
^t^C^^-.
The organic matrix of
dentine belongs to the glue-
giving substances. "When
Epithelial Scales from the Oral Cavity.
decalcified dentine is
Partly destroyed by cocci. Ca. 500 : 1.
boiled for any length of
time, a gelatinous material is obtained, which solidifies on cooling.
Dry gelatine from dentine forms an odorless and colorless, or
faintly yellowish mass, like bone-glue, which swells up in cold
water, dissolves easily in hot, but is insoluble in alcohol and
ether. At blood temperature dentine gelatine, like other gluey
substances, is easily decomposed by bacteria, and my personal
experience has shown it to be a good medium for culture
experiments.
5. The Dental Pulp.
On account of its delicate structure and the abundance of
blood, the dental pulp presents an exceedingly favorable nutri-
ent medium, and therefore very easily putrefies. By means of
a dead pulp spontaneous inoculations (auto-infections) readily
occur, from which very dangerous local or general poisonings
may result.
6. Exudations of the Gums.
The gums, when irritated by accumulations of tartar or food,
or by sharp edges, protruding fillings, roots, etc., furnish par-