h a small quantity of volatile
alcali in water.

3. _Catarrhus frigidus._ The thin discharge from the nostrils in cold
weather. The absorbent vessels become torpid by the diminution of external
heat, sooner than the secerning ones, which are longer kept warm by the
circulating blood, from which they select the fluid they secrete; whereas
the absorbent vessels of the nostrils drink up their fluids, namely the
thin and saline part of the mucus, after it has been cooled by the
atmosphere. Hence the absorbents ceasing to act, and the secerning vessels
continuing some time longer to pour out the mucus, a copious thin discharge
is produced, which trickles down the nostrils in cold weather. This
discharge is so acrid as to inflame the upper lip; which is owing to the
neutral salts, with which it abounds, not being reabsorbed; so the tears in
the fistula lacrymalis inflame the cheek. See Class I. 1. 2. 7.

4. _Expectoratio frigida._ Cold expectoration. Where the pulmonary
absorption is deficient, an habitual cough is produced, and a frequent
expectoration of thin saline mucus; as is often seen in old enfeebled
people. Though the stimulus of the saline fluid, which attends all
secretions, is not sufficient to excite the languid absorbent vessels to
imbibe it; yet this saline part, together with the increased quantity of
the whole of the secreted mucus, stimulates the branches of the bronchia,
so as to induce an almost incessant cough to discharge it from the lungs. A
single grain of opium, or any other stimulant drug, as a wine-posset with
spirit of hartshorn, will cure this cold cough, and the cold catarrh of the
preceding article, like a charm, by stimulating the torpid mouths of the
absorbents into action. Which has given rise to an indiscriminate and
frequently pernicious use of the warm regimen in coughs and catarrhs of the
warm or inflammatory kind, to the great injury of many.

M. M. Half a grain of opium night and morning promotes the absorption of
the more fluid and saline parts, and in consequence thickens the mucus, and
abates its acrimony. Warm diluent drink, wine-whey, with volatile alcali.

5. _Urina uberior pallida._ On being exposed naked to cold air, or
sprinkled with cold water, a quantity of pale urine is soon discharged; for
the absorbents of the bladder become torpid by their sympathy with those of
the skin; which are rendered quiescent by the diminution of external heat;
but the kidnies continue to secret