HE A this affection, ought to drink no s t a 1 - ■ or acid lie I u> abstain from flatulent food. If indigestion, or debility of the stomuh, be the cause, th • ;>uient rniv take infusions of Peruvian bark, valerian, or any other sto- i o bitter. Moderate exercise in the open air will contribute to promote digestion, and consequent- ly remove the complaint. S 10 lid the heart-burn originate from acidity of the stomach, the general practice is to administer absorbent medicines, such as pre- pared chalk, crab's claws, calcined oyster-shells, 8rc. a tea-spoonful of either being given in a glass of neppermint-water, which frequent- ly procures relief. There are, however, many cases in which absorbents tend to aggra- vate rather than to cue this trou- blesome affection ; namely, when it proceeds from an acrid and em- pyreumatic oil generated on the stomach. In such instances, a tea-spoonful of the powder of gum- arabic dissolved in half a tea-cupful of water, and repeating this dose th^ee or four times, if necessary] has been attended with immediate success; and, where the gum can- not be procured, a few bianched sweet- almonds finely chewed, and swallowed, have often produced a similar effect:. If the heart-burn originate from flatulency, the remedies pointed out for that affection, may be here safely resorted to ; such as infu- sions of anise-seeds, ginger/ and other carminatives. HEARTs -EASE, or Herb Trinity, Viola tricolor, L. an in- digen us annual plant, growing in corn-fields, bcc. It produces gene- rally white and yellow blossoms, intermixed with purple,, which NO, VIII. — VOL. II. H £ A [449 i from M iv t,> S 'ptefhberi This plant has aim i va- rieties, and, when reared In gar- dens, is known under the name of Panties. It was formerly in great repute for epilepsies, asth- mas, &c. At present, how it is used Only in !h'- disorder pe Mi- liar to children, called cries ta lac tea, or a species of scald-head affecting "the face. A handful of the fresh, or half a dram of the dried leav S, is boiled ia a pint of milk, and if eontinu 1 to be drunk for some W lin- ing and evening it has invariably been attended with success. HEAT, signifies either the pe- culiar sensation we feel on the ap- proach of buraaing bodies, or the cause of th; Fe t which is Firk. Heat is now universally consi- dered as a modification of a fluid; but, after the various inquiries of the most able chemists, much re- mains to be done towards ascer- taining all the phenomena of this subtle and invisible element. In this place, we shall only select a few principles in some degree illustrative of its nature and pro- perties : 1. Heat and cold mu- tually expel each other. 2. Heat is visihlu occasioned by the con- centration of ' the rays of the sun, and also of the electric fluid. As fire, therefore, is evidently the cause of heat, it follows that both the light of the sun and the electric fluid are elementary fire. 3. Heat expands bodies in every direction ; hence the elementary fluid, when producing heat, acts from a centre towards a circumference ; and, when it generates cold, moves in a contrary direction . 4. It is, therefore, impossible to calculate the precise quantity of heat which any substance contains. 5. Heat G g assists
