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A44236 Observations touching the principles of natural motions, and especially touching rarefaction & condensation together with a reply to certain remarks touching the gravitation of fluids / by the author of Difficiles nugae. Hale, Matthew, Sir, 1609-1676. 1677 (1677) Wing H252; ESTC R8786 90,509 299

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than once answered which I think is done in my Observations upon Remark 17 c. Then he proceeds to the Argument touching Rarefaction and the inconvenience of the penetration of dimensions and so endeavours to prove repugnancies in what is said by a Problem that deserves more discussion than the Argument in hand as hath been shewed in the beginning of this Book wherein I have nevertheless expressed my thoughts touching it I cannot tell what the Remarker imagines or conceives against the cohesion of grosser Bodies by the tension of lighter bodies but I can tell what is evident to my sense and so may any that will give his Senses leave freely to determin without stifling them by Notions namely that there is as plain a cohesion in the Magdeburgh Hemispheres yea and in the Torricellian Engin as there is between things fastned each to other by a string And therefore I cannot so over-readily change the conviction of my Senses for a Notion or Conception asserted and magnified but not proved But to infer that because Water which is above 900 times crasser than Air is not compressible to a sensible smaller room by a great weight therefore a portion of subtil Matter cannot be extracted out of it or Mercury with so small a weight as the Mercurial Cylinder or that the effluvia of Water or Mercury which are as subtil as Air cannot be expanded by a less weight than Water compressed into a sensible narrower room seem hard illations and very inconsequential for we see the heat of a mans hand will expand Air in Weather-Glasses to near a double extension REMARK XXXIV I Do prove the attraction of tensed Bodies by the plain evidence of Sense and I assign the preservation of the continuity of the Universe as the end thereof and the supream efficient cause thereof to be the most wise and powerful Creator of all things and the immediate effective cause that instituted Law that he hath placed in things natural the immediate instrumental cause in many motions that are not primitive in their Subjects to be from the singular disposition of the part of the Universe their admirable mechanical adaptation each to other And as to the vicarious Spirit of Nature as a distinct incorporeal subsistence when the Author hath given us better proofs thereof than the suspending of Mercury in the Torricellian Experiment the driving up a Rundle of light wood by the Water and potentia attractiva of the Embolus of the Air-Pump and such like petty Instances together with his bare Notion touching it It may possibly obtain a better entertainment than yet I find it doth at least with me REMARK XXXV THis Instance in the Bladder and Cupping-Glasses is passed over in this Remark very lightly and it was necessary so to be dealt with because too troublesome to be explicated otherwise than by Tension and Attraction and it would require an admirable process in the Hylarchical Principle to effect this and some proof besides single Notions and Conceptions of such explication by such a principle REMARK XXXVI THe Instance here given hath put the Remarker to a great deal of pains to find a solution for it and the consequences of it for the Hypothesis of Attraction is confidently said to be fully confuted though it be only so said but not so done But yet the Hylarchical Principle is at length furnished with an Hylostatical Libration and Hylostatical power of union of the several parts of Water Air and Glass And at this rate I confess there will never want a ready solution to any difficulty for it is but asserting that the Spirit of Nature is furnished with that effectual power and the knot is untied or cut though there be not a Syllable of proof offered for it but it is only graffed on to the Hypothesis of the Spirit of Nature by the wit of the Assertor to accommodate the Hypothesis REMARK XXXVII I Refer my self to what is said before in the first Chapter of this Book and upon the same Remark there need not be said more The Laws of Nature were the Laws of God imprinted upon the nature of Physical Beings by his Almighty Fiat and though as to particular Beings he hath substituted particular active principles usually called Essential and Vital Forms yet as to the Universe it self it seems to be too great an Empire to be put into the vicariat hands of that which is here called the Spirit of Nature The great God that gave the Laws of Nature is sufficient without such a Substitute and is only sufficient for the regiment of so great an Empire and this may serve also to Remark 38. We are not disputing whether such a Spirit of Nature be possible to be but whether de facto it be or not or that it is necessary that it should be at least as to those motions which have so evident explication from other principles REMARK XXXIX HErein we differ not as to the rejecting of the great Elasticity of the Air. REMARK XL. I Confess when I read the beginning of this Remark I hoped to meet with such a Solution to the Instance remarked upon as would be close and clear because this Instance bears so hard against most of what the Remarker hath before affirmed but I was deceived herein In this Instance of the Magdeburg Hemispheres these things are most evident to any mans Sense 1. That the included Air is certainly expanded and rarefied by the heat beyond its natural size 2. That while they are so hot and the Air so expanded and lax they do not at all cohere 3. That as they grow cold they do most evidently cohere so that they will not be divulsed without a considerable strength 4. That most necessarily as the included Air grows cold and the heat which was the cause of its expansion decayes so the Air must needs endeavour its restitution to its natural dimension by contracting it self inward to its natural size 5. And yet if it have such a degree of heat as again gives a more lax state to the included Air the cohesion will cease and the Hemispheres fall asunder 6. And as the Remarker confesseth and the most clear evidence of Sense evinceth those Phaenomena are not wrought nor indeed possible to be wrought either by the weight pressure or elasticity of the external Air as the Elaterists would have it The Consequence of all which is that certainly as far as Sense can lead us the Air is rarefied by the Heat and as the Heat decayes the Air endeavours its own contraction and there necessarily follows even to our Sense an attraction upon the sides of the Hemispheres whereby they cohere and that cohesion will continue till relaxed by another accession of Heat or admission of more Air. But now what doth the Remark propound in this Instance Marry an Hylostatical Spirit which pro re nata works these various Phaenomena which is only a conjecture and hath no evidence to prove it