. 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. fa-r. 668. p-^f ? l^he Pneumatkal Experiments defended. (581 TIC« might eafily have perceivd, that we did make a trial much of the^^^j^^^^fame nature with that he defires : for, we weighed the air in a glafs, her- >^v^^metically feald, wherein it was not blown in, but barely included. Andfmce, in his elements of philofophy, he grants, and gives his reafon forit, that, if air be blown into a
. 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. fa-r. 668. p-^f ? l^he Pneumatkal Experiments defended. (581 TIC« might eafily have perceivd, that we did make a trial much of the^^^j^^^^fame nature with that he defires : for, we weighed the air in a glafs, her- >^v^^metically feald, wherein it was not blown in, but barely included. Andfmce, in his elements of philofophy, he grants, and gives his reafon forit, that, if air be blown into a hollow cylinder, or, into a bladder, it*will increafe the weight of either of them ahttle- and, fince here helikewife confefles, that there are mixd with the sether, many aqueous and^earthy particles: he confefles, that the air is not deftitute of weight; and itconcerns us no more than himfelf, to fhew how the corpufcles, upon whofeaccount the air is heavy, make it fo. This is all which Mr. Hobhs, in feveral places, thinlts fit to oW]t€t a-gainft the gravity of the air; leaving the experiment of the jeolipiie, andfome others, unanfwerd ; which, alone, prove the air has a manifeft weight,even when uncomprefsd,
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