The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . used as asand heat. For. this furnace the properfuel, when it is used as a wind furnace, iswood charcoal, either alone, or with theadmixture of a small proportion of distillation with a sand heat, charcoal,with a little pit coal, may be employed. 378. The Heat communicated from bodies in combustionmust necessarily vary according to circumstances ; whenever
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . used as asand heat. For. this furnace the properfuel, when it is used as a wind furnace, iswood charcoal, either alone, or with theadmixture of a small proportion of distillation with a sand heat, charcoal,with a little pit coal, may be employed. 378. The Heat communicated from bodies in combustionmust necessarily vary according to circumstances ; whenever,therefore, an equable, rather than a high temperature isrequired, it will be expedient to interpose a quantity of sand,or other matter, between the fire and the vessel intended tobe heated. The sand bath, and the water bath* are mostcommonly used for such a purpose; it has been alreadystated that a bath of steam may in some instances be foundpreferable. (360) A considerably greater heat may be givento the water bath by dissolving various salts in it; thus asaturated solution of common salt boils at 225° 3 Fah.; byusing a solution of muriate of lime, a bath of any temperaturefrom 212° to 252° may be conveniently * The water bath was called Balneum Maria by the older chemists. 25 iDl tARlfs ftlEUlCAL CMEMlVfM E. By Cliemical Action. 379. This source of heat is scarcely applicable to anypractical purpose, except by furnishing a ready method ofkindling fire; thus, if matches impregnated with sugar andchlorate of potass, be dipped into sulphuric acid, they burstinto flame. A lamp has been lately presented to thepublic for procuring fire, or an instantaneous light, whichowes its operation to the singular action of Hydrogen upon aparticular preparation of Platinum. F. By the Suns Rays. 380. The rays of the sun are applied for the drying ofmany vegetable substances, as \\-A\ as for promoting spon-taneous evaporation. By means of a double convex lens,a concave mirror, or
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