ead with warm vinegar. Drink two large spoonfuls of vinegar. Stimulate
the gums of the suspected teeth by oil of cloves, by opium. See Class I. 1.
4. 4. Snuff volatile spirit of vinegar up the nostrils. Lastly, in
permanent head-achs, as in permanent vertigo, I have seen good effect by
the use of mercurial ointment rubbed on the shaved head or about the
throat, till a mild salivation commences, which by inflaming the membranes
of the teeth may prevent their irritative sympathy with those of the
cranium. Thus by inflaming the tendon, which is the cause of locked jaw,
and probably by inflaming the wound, which is the cause of hydrophobia,
those diseases may be cured, by disuniting the irritative sympathy between
those parts, which may not possess any sensitive sympathy. This idea is
well worth our attention.

_Otalgia._ Ear-ach is another disease occasioned by the sympathy of the
membranes of the ear with those which invest or surround a decaying tooth,
as I have had frequent reason to believe; and is frequently relieved by
filling the ear with tincture of opium. See Class I. 2. 4.

9. _Dolor humeri in hepatitide._ In the efforts of excluding the faeces and
urine the muscles of the shoulders are exerted to compress the air in the
lungs, that the diaphragm may be pressed down. Hence the distention of the
tendons or fibres of these muscles is associated with the distention of the
tendons or fibres of the diaphragm; and when the latter are pained by the
enlargement or heat of the inflamed liver, the former sympathize with them.
Sometimes but one shoulder is affected, sometimes both; it is probable that
many other pains, which are termed rheumatic, have a similar origin, viz.
from sensitive associations.

As no inflammation is produced in consequence of this pain of the shoulder,
it seems to be owing to inaction of the membranous part from defect of the
sensorial power of association, of which the primary link is the inflamed
membrane of the liver; which now expends so much of the sensorial power in
general by its increased action, that the membranes about the shoulder,
which are links of association with it, become deprived of their usual
share, and consequently fall into torpor.

10. _Torpor pedum in eruptione variolarum._ At the commencement of the
eruption of the small-pox, when the face and breast of children are very
hot, their extremities are frequently cold. This I ascribe to sensitive
association between the differ