oned, namely, the urethra and the bile-duct; hence when too
great acidity of undigested aliment, or the carbonic acid air, which
escapes in fermentation, stimulates the cardia ventriculi, or lower end of
the gula, into pain; the pharinx, or upper end of it, is affected with
greater pain, or a disagreeable sensation of heat.

6. _Pruritus narium a vermibus._ The itching of the nose from worms in the
intestines is another curious instance of the sensitive associations of the
motions of membranes; especially of those which constitute the canals of
the body. Previous to the deglutition of agreeable food, as milk in our
earliest infancy, an agreeable odour affects the membrane, which lines the
nostrils; and hence an association seems to take place between the
agreeable sensations produced by food in the stomach and bowels, and the
agreeable sensations of the nostrils. The existence of ascarides in the
rectum I believe produces this itching of the nostrils more than the worms
in other parts of the intestines; as we have already seen, that the
terminations of canals sympathize more than their other parts, as in the
urethra and gall-ducts. See Class I. 1. 5. 9. IV. 1. 2. 9.

7. _Cephalaea._ Head-ach. In cold fits of the ague, the head-ach arises
from consent with some torpid viscus, like the pain of the loins. After
drunkenness the head-ach is very common, owing to direct sympathy of the
membranes of the head with those of the stomach; which is become torpid
after the too violent stimulus of the preceding intoxication; and is hence
removeable by spirit of wine, or opium, exhibited in smaller quantities. In
some constitutions these head-achs are induced, when the feet are exposed
to much external cold; in this case the feet should be covered with oiled
silk, which prevents the evaporation of the perspirable matter, and thence
diminishes one cause of external cold.

M. M. Valerian in powder two drams three or four times a day is
recommended. The bark. Chalybeates. A grain of opium twice a day for a long
time. From five to ten drops of the saturated solution of arsenic two or
three times a day. See Class I. 2. 4. 11. A lady once assured me, that when
her head-ach was coming on, she drank three pints (pounds) of hot water, as
hastily as she could; which prevented the progress of the disease. A
solution of arsenic is recommended by Dr. Fowler of York. Very strong
errhines are said sometimes to cure head-achs taken at the times the p