. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. r out of it * It maybe pretended, that tis not the air,^ tartar, reduced to fine powder, and made but fome vapour, or exhalation, containd ; hot, to the neck of the former ; fo that in it, that here weighs upon the balance, i the external air muft pafs flowly thro this To obviate this objeftion, M. Mufchenbropck \ fait, before it could pofTibly get into the contrived the following experiment. Tis j e
. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. r out of it * It maybe pretended, that tis not the air,^ tartar, reduced to fine powder, and made but fome vapour, or exhalation, containd ; hot, to the neck of the former ; fo that in it, that here weighs upon the balance, i the external air muft pafs flowly thro this To obviate this objeftion, M. Mufchenbropck \ fait, before it could pofTibly get into the contrived the following experiment. Tis j exiiaufled vcflTei; whereby the air that en- a known thing in chymiftry, that dry alkaline falts attraft, and abforb the moiftureof the air, and thereby run, -per delicjiuumyas tis called. That philofopher, there-fore, having exhaufted a proper veflfcl ofits air, fitted another veflel, wherein waslodgd a large quantity of very dry fait of rred, ftiained, uud perfectly freed fromany moifture tnat might have been lodgedtherein. The veffel being thus filld withpure air, and put into the fcale, was foundto weigh as much as when filld with un-purged air. Ve Mater* fabtil.^ ]* by Vi> rv^Z5 Phy/Icc-mechamcal Experiments. 45? by heat, we think the proportion may held good : however, in a round fum Pneumatics:?we may fay, water is near looo times heavier than air. And accordingly,, ^^-^vNii/having, at another time, put fome water in the seoiipile, before we fetit onthe £re, that the vapours of the rarified liquor might the better driveout the air, we found, upon trial carefully made, that when the jeolipilewas refrigerated, and the included vapours, by the cold, turned again intowater; the air being let in, increasd the weight of the a^olipile, elevengrains, as before; tho there were already in it, twelve drams, and 32 •grains of water, which remaind of that we had put into it, to drive outthe air. Merfennus, indeed, tells us, that, by his account, air is in weightto wat
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