ent parts of the skin; whence when a part
acts too violently, the other part is liable to act too weakly; and the
skin of the face being affected first in the eruption of the small-pox, the
skin of the feet becomes cold in consequence by reverse sympathy.

M. M. Cover the feet with flannel, and expose the face and bosom to cool
air, which in a very short time both warms the feet and cools the face; and
hence what is erroneously called a rash, but which is probably a too hasty
eruption of the small-pox, disappears; and afterwards fewer and more
distinct eruptions of the small-pox supervene.

11. _Testium dolor nephriticus._ The pain and retraction of the testicle on
the same side, when there is a stone in the ureter, is to be ascribed to
sensitive association; whether the connecting cause be a branch of the same
nerve, or from membranes, which have been frequently affected at the same
time.

12. _Dolor digiti minimi sympatheticus._ When any one accidentally strikes
his elbow against any hard body, a tingling pain runs down to the little
finger end. This is owing to sensitive association of motions by means of
the same branch of a nerve, as in hemicrania from a decaying tooth the pain
is owing to the sensitive association of tendons or membranes.

13. _Dolor brachii in hydrope pectoris._ The pain in the left arm which
attends some dropsies of the chest, is explained in Sect. XXIX. 5. 2. 10.
which resembles the pain of the little finger from a percussion of the
nerve at the elbow in the preceding article. A numbness of this kind is
produced over the whole leg, when the crural nerve is much compressed by
sitting for a time with one leg crossed over the other.

Mr. ----, about sixty, had for two years been affected with difficulty of
respiration on any exertion, with pain about the sternum, and of his left
arm; which last was more considerable than is usual in dropsy of the chest;
some months ago the pain of his arm, after walking a mile or two, became
excessive, with coldness and numbness; and on the next day the back of the
hand, and a part of the arm swelled, and became inflamed, which relieved
the pain; and was taken for the gout, and continued several days. He after
some months became dropsical both in respect to his chest and limbs, and
was six or seven times perfectly relieved by one dram of saturated tincture
of digitalis, taken two or three times a day for a few days in a glass of
peppermint water. He afterwards