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A47115 An examination of the Reflections on the theory of the earth together with a defence of the remarks on Mr. Whiston's New theory / by J. Keill... Keill, John, 1671-1721. 1699 (1699) Wing K133; ESTC R14756 75,896 185

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find that the Theorist makes any mention of these Cracks for that purpose The only question is whither the heat of the Sun could reach so low as the Abyss when the Earth was dry'd and its Pores inlarged Here he is mistaken this is not the only question for there is another material one besides viz. That supposing the heat of the Sun had reached the Abyss whether there could have been vapours enough extracted from it to furnish the Earth And I think I have prov'd that there could not But it seems he will not allow of the Calculation because it supposes that the Sun acted thro' large cracks fissures and chaps which he says the Theorist did not mention for any such purpose but he will have the Sun to have acted only thro' the Pores of the Earth Well let us grant his supposition that the Sun did not act thro' large cracks and fissures which I thought would best serve his designe but only thro' the Pores of the Earth and we will see how much the Theorist will gain by it I am accused of dealing unfairly with the Theorist when I make him suppose that Mountains make way for the motion and dilatation of vapours If this is unfair dealing I cannot tell what will be fair for the Theorist himself has expresly said so in his Book 11. Chap. 5. Parag. 4. of the English Theory Where speaking of the North and South parts of the World which he says draw the vapours to them his words are these The cold of those parts attracting them as we call it that is making way to their motion and dilatation without resistance as Mountains and cold places usually draw vapours from the warmer Tho I quoted these words in the Examination yet the Defender assures us that the Theorist supposes no such thing It seems then that he can say one thing and suppose another If so I wish the Defender would give us two Catalogues one of those things which he says and supposes to be true and another of those things he says without supposing them to be true I hope in this last we should find what is said in the 7th 8th and 9th Chapters of the Archaeologiae concerning the Mosaical account of the Formation of the World its Primitive State and the Fall of Man Our next dispute is about the course of the vapours The Theorist asserted that it would be towards North and South Now I prov'd that it would be from East to West because I demonstrated that there must be a continual wind blowing that way in an Earth where there were no Mountains to change the direction of the wind just as it is now in the Atlantick and Pacisick Oceans And seeing the vapours swim in an Air of the same intensive gravity with themselves it is demonstrable that they must follow the motion of that Air and be likewise carry'd from East to West The Defender grants that their motion would be at first that way But says he the question here is where they would be condensed or where they would fall I think it does not signify any thing where they fall for I am sure they would not fall or be condensed in a place to which they were never carry'd that is towards either of the Poles The Theorist was of the opinion that the cold in the North and South parts attracted the vapours thither that is as he explains it made way for their motion and dilatation But because I shew'd that this method savoured a little of absurdity our Theory-mender says that the vapours were diverted towards North and South by an impulse of new vapours This opinion seems to me to be as unnatural as the other for if the vapours were crouded on one another by their mutual impulses they would condense one another and fall down in the places where they were crouded I am sure it is impossible that an attome of vapour however impell'd should make its way thro' an Atmosphere of the same gravity with its self for some thousands of Miles towards either of the Poles when a stone which has some thousand times more density than vapours and consequently some thousands of times also more force to break the resistance of the medium if it were to move to Eternity in the Air yet it would never make any considerable way in the medium by reason of the continual loss of its motion It seems to contradict our senses to suppose that vapours can move thro' the Air without suffering such a resistance as must condense them We observe that those vapours which are in the Clouds when the Air grows light begin to fall no doubt in the form of vapours but afterwards suffering a considerable resistance from the Air they are condensed into drops of Rain If then the resistance the vapours meet with for so small a way be sufficient to condense them is it not naturally impossible that they should travel some thousands of Miles and not be condensed till they arive at the Poles Our Author proceeds in the next place to consider the seventh Chapter of the Examination and answer the arguments that are brought against the Theorist's way of making a Deluge It is suppos'd in the Theory that after some ages the heat of the Sun must have peirced thro' the Crust of the Earth and reached the Abyss where it must have rarify'd the waters there and rais'd an immense quantity of them into vapours these endeavouring to expand themselves and the Pores of the Earth not being sufficient to let them pass thro' would press upon the Crust and break it into peices so that its fall upon the Abyss would produce an universal Deluge Against this I objected that it is impossible the heat of the Sun could reach far into the Earth so as to perform any considerable effect since by observation it was found that in Caves and Vaults there was not any sensible alteration of heat in Summer and Winter and therefore seeing that the heat of the Sun had so little effect in places of the Earth that were so near its surface how could any one imagine that it would have any upon the Abyss which was covered over with a thick Crust But because this argument was propos'd in general terms I endeavour'd to bring it to Calculation in order to which I assumed one postulatum viz. That fewer Rays of heat passed to the Abyss thro' the Crust than if it had been compos'd of several surfaces at some considerable distance from one another suppose 10.20 or 30. feet every one of which reflected half the Rays which fell upon them and transmitted the other half ' This I thought was a postulatum which every body would have granted and if we consider how much of the Suns light and heat is diminished by a thin Cloud of vapours placed between it and us and how much light is reflected by the common Air when it passes thro' it we cannot but own that the diminution of heat in