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defined part on the parietal bone, or one side, it is generally
termed clavus hystericus, and is always, I believe, owing to
a diseased dens molaris. The tendons of the muscles, which
serve the office of mastication, have been extended into pain
at the same time that the membranous coverings of the
roots have been compressed into pain, during the oiting or
mastication of hard bodies. Hence, when the membranes
which cover the roots of the teeth become affected with
pain, by a beginning decay, or perhaps, by the torpor or
coldness of the dying part of the tooth, the tendons and
membranous fascia of the muscles about the same side of
the head, become affected with violent pain by their sensitive
associations ; and as soon as this associated pain takes place,
the pain of the tooth entirely ceases.
The dens sapientia, or last tooth of the upper jaw frequent-
ly decays first, and gives hemicrania over on the same side.
The first or second grinder in the upper jaw is liable to give
violent pain about the middle of the parietal bone, or side of
the head, on the same side, which is generally called clavus
hystericus." He places hemicrania as a disease of associa-
tion, and produced by diseased teeth in many cases. He con-
tinues,* " The last tooth, or dens sapientia, of the upper jaw,
most frequently decays first, and is liable to produce pain
over the eye and temple of that side. The last tooth of the
under jaw is also liable to produce a similar hemicrania,
when it begins to decay. When a' tooth in the upper jaw is
the cause of head-ach, a slighter pain is sometimes perceived
on the cheek-bone. And when a tooth in the lower jaw is
the canse of head-ach, a pain sometimes affects the muscles
of the tendons of the neck, which are attached near the
jaws. But the clavus hystericus, or pain about the middle

* ZooDomia, Section 36-2-1.