. 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. ployit, as formerly, to weigh the air it would contain. To make this ex-periment the more exadly, the air was, by a ftrong fire, carefully drivenaway j when clapping a piece of fealing-wax to the pin-hole, at which ittiad been forcd out, we prevented a communication betwixt the cavity ofthe inftrument, and the external air; and fuppofing the seolipile to be verywell exhaufted, we laid it by, that whe
. 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. ployit, as formerly, to weigh the air it would contain. To make this ex-periment the more exadly, the air was, by a ftrong fire, carefully drivenaway j when clapping a piece of fealing-wax to the pin-hole, at which ittiad been forcd out, we prevented a communication betwixt the cavity ofthe inftrument, and the external air; and fuppofing the seolipile to be verywell exhaufted, we laid it by, that when it Ihould be grown cold, wemight, by opening the orifice again, let in the outward air, and obfervewhat increafe of weight it would make. But the inltrument had been fofar exhaufted, that what air remained, being unable by its fpring to afliftthe jeolipile to fupport the weight of the furrounding air; this externalfluid did, by its weight, fo ftrongly comprefs it, and thruft it fo confide-rably inwards, and, in more than one place, fo change its figure, thatwhen I fhewd it to the Gentlemen affembled at Grejham College^ theywere pleased to command it of me, to be kept in their AN ( 7 ) A N INQUIRY INTO THE Caufe of AttraQ:ion B Y S U C T I O N. SUCTION being, generally, lookM upon as a kind of attraftionj k^^^ ^?^««will be requifite to premife fomething about the latter, in order toclear the nature of the former. The caufe, nature, and notion ofattraction, are, generally, either left untouchd, or happen to be but veryobfcurely deliverd. How general and antient foever, the common opinion may be, that attrac-tion is a kind of motion quite different from pulfion, I confefs, it feems tome, a fpecies of pulfion ; at leafl, among inanimate bodies. I have not, yet,,obferv Q any thing which fhews attraction cannot be reduced to pulfion :for they feem but extfinfical denominations of the fame local motion, inwhich, if a moved body precede the movent, or tend to get at a
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