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342 THE MICRO-ORGANISMS OF THE HUMAN MOUTH.

d. On the periosteum of the upper jaw.
e. In the region of the cheek.
2. Cases of primary actinomycosis of the respiratory tract.
3. Cases of primary actinomycosis of the intestinal tract.
4. Cases with uncertain point of entrance.
In dental literature very few cases of actinomycosis homiinis
have l)een published. I can recall only one, but unfortunately
am not able to give a full description of it.
In medical literature, on the other hand, we iind quite a num-
ber of cases of actinomycosis hominis. With the assistance
of Baumgarten's Jahresberichte, 1885-87, I have been able to
collect seventy-five cases, in addition to the thirty-eight mentioned
by Israel, making a sum total of one hundred and thirteen. Of
the newly-added cases, forty-eight have been described by
Hochenegg,-^ Rotter ,^^^ Partsch,^*^ Moosbrugger,^^ Eoser,^^ and
Braun.^
Of the one hundred and thirteen, about fifty-three must be
placed under the first division of Israel's classification. The
region of the mouth is consequently particularly prone to this
infection.
Israel refers the infections of the lower jaw and neck region
chiefly to the colonization of the ray-fungus in carious teeth,
but minor injuries or defects of the mucous membrane may also
sufiice to create an entrance-point. (Ponfick, Partsch.)
We consequently have here again another dangerous source
of infection in the human mouth, which the dentist and physi-
cian do well not to lose sight of.