as above directed, taking care to deduct from the water obtained the quantity whichwould have been produced by the matras alone, which must be ascertained by a previousexperiment. The table of the results obtained by these experiments is omitted, becausenot yet sufficiently complete, different circumstances having occasioned the series to beinterrupted; it is not, however, lost sight of; and we are less or more employed upon thesubject every winter.CHAP. IV.Of Mechanical Operations for Division of Bodies.SECT. I.Of Trituration, Levigation, and Pulverization.These are, properly speaking, only preliminary mechanical operations for dividing andseparating the particles of bodies, and reducing them into very fine powder. Theseoperations can never reduce substances into their primary, or elementary and ultimateparticles; they do not even destroy the aggregation of bodies; for every particle, after themost accurate trituration, forms a small whole, resembling the original mass from whichit was divided. The real chemical operations, on the contrary, such as solution, destroythe aggregation of bodies, and separate their constituent and integrant particles from eachother.Brittle substances are reduced to powder by means of pestles and mortars. These are ofbrass or iron, Pl. I. Fig. 1.; of marble or granite, Fig. 2.; of lignum vitae, Fig. 3.; of glass,
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