art, which is
affected secondarily, is believed to be much more sensible than the part
primarily affected, as described in the catalogue of diseases, Class II. 1.
1. 11. and IV. 2. 2. 2. and IV. 2. 2. 4.

The hemicrania, or nervous headach, as it is called, when it originates
from a decaying tooth, is another disease of this kind; as the pain of the
carious tooth always ceases, when the pain over one eye and temple
commences. And it is probable, that the violent pains, which induce
convulsions in painful epilepsies, are produced in the same manner, from a
more sensible part sympathizing with a diseased one of less sensibility.
See Catalogue of Diseases, Class IV. 2. 2. 8. and III. 1. 1. 6.

The last tooth, or dens sapientiae, 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 the headach, a slighter pain is sometimes perceived on the
cheek-bone. And when a tooth in the lower-jaw is the cause of headach, a
pain sometimes affects the tendons of the muscles of the neck, which are
attached near the jaws. But the clavus hystericus, or pain about the middle
of the parietal bone on one side of the head, I have seen produced by the
second of the molares, or grinders, of the under-jaw; of which I shall
relate the following case. See Class IV. 2. 2. 8.

Mrs. ----, about 30 years of age, was seized with great pain about the
middle of the right parietal bone, which had continued a whole day before I
saw her, and was so violent as to threaten to occasion convulsions. Not
being able to detect a decaying tooth, or a tender one, by examination with
my eye, or by striking them with a tea-spoon, and fearing bad consequences
from her tendency to convulsion, I advised her to extract the last tooth of
the under-jaw on the affected side; which was done without any good effect.
She was then directed to lose blood, and to take a brisk cathartic; and
after that had operated, about 60 drops of laudanum were given her, with
large doses of bark; by which the pain was removed. In about a fortnight
she took a cathartic medicine by ill advice, and the pain returned with
greater violence in the same place; and, before I could arrive, as she
lived 30 miles from me, she suffered a paralytic stroke; which affected her
limbs and her face on on