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By H. DUSSAUCE

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Example text

An operation which consists in passing a liquid through a porous body, which retains the solid substances. It has for its object to clarify. the liquid, or to collect the solid bodies ~ixed with it, or to attai n these two results at the same tinle. Sorne~imes the filter is a piece of felt, or a frame covered with a piece of woollen or cotton cloth, or e·ven a piece of filtering paper; sometimes it is composed of vessels with several bottoms, pierced with holes and covered with one or several beds of straw, cotton, sand, or charcoal.

It is sol ubIe in alcohol, ethers, fixed and volatile oils, greases, me] ted resin, etc. An artificial camphor is manufactured by passing a slow current of hydrochloric acid gas through spirit of turpentine, kept at a low ternperature. The gas is absorbed, and, after'a certain tirne, a white Stl bstance, having the odor of camphor, is deposited. 'fhis Stl bstance is the chlor~ hydrate of camphene, or artijicia l camphor. Camphor is used in perfumery to flavor soaps~ tooth po\vders, sachets, and other preparations.

Rbe dissolution is also called solut£orz. Any body which disappears in "vater or some other liquid, without destroying its transparency, is soluble, and the liq uid which contains it is called a dissolution. In this state -the body has not lost its prilnitive properties. Sugar,rlissolved in water, has l\lA~IPtJLATIONS. 43 the same sweet taste which characterized it \vhen solid. Water is a precious sol vent in the sense that bodies dissolved in it retain their properties. Insoluble bodies render liq uid~ muddy, being deposited after a time more or less long, and form what is called a prec£p£tnte or depos~·t.

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