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woman_n breast_n child_n milk_n 2,381 5 10.1992 5 true
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A43983 Decameron physiologicum, or, Ten dialogues of natural philosophy by Thomas Hobbes ... ; to which is added The proportion of a straight line to half the arc of a quadrant, by the same author. Hobbes, Thomas, 1588-1679.; Hobbes, Thomas, 1588-1679. Proportion of a straight line to half the arc of a quadrant. 1678 (1678) Wing H2226; ESTC R2630 62,801 138

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first Endeavour of the Movent which Endeavour how weak soever is also Motion For if it have no Effect at all neither will it do any thing though doubled trebled or by what number soever multiplied For Nothing though multiplied is still Nothing Other Axiomes and Definitions we will take in as we need them by the way A. Is this all the preparation I am to make B. No you are to consider also the several kinds and properties of Motion viz. when a Body being moved by one or more Movents at once in what way it is carried straight circular or otherwise crooked and what degree of swiftness as also the action of the Movent whether Trusion Vection Percussion Reflexion or Refraction and further you must furnish your self with as many experiments which they call Phaenomenon as you can And supposing some Motion for the Cause of your Phaenomenon try if by evident Consequence without contradiction to any other manifest truth or experiment you can derive the Cause you seek for from your Supposition If you can 't is all that is expected as to that one Question from Philosophy For there is no Effect in Nature which the Author of Nature cannot bring to pass by more ways than one A. What I want of Experiments you may supply out of your own store or such Natural History as you know to be true though I can be well content with the knowledge of the Causes of those things which every Body sees commonly produced Let us therefore now enquire the Cause of some Effect particular B. We will begin with that which is the most universal the Universe and enquire in the first place if any place be absolutely empty that is to say in the language of Philosophers whether there be any Vacuum in Nature CAP. III. Of Vacuum A. 'T Is hard to suppose and harder to believe that the Infinite and Omnipotent Creator of all things should make a work so vast as is the world we see and leave a few little spaces with nothing at all in them which put altogether in respect of the whole Creature would be insensible B. Why say you that Do you think any Argument can be drawn from it to prove there is Vacuum A. Why not For in so great an Agitation of Natural Bodies may not some small parts of them be cast out and leave the places empty from whence they were thrown B. Because he that created them is not a Fancy but the most real substance that is who being Infinite there can be no place empty where he is nor full where he is not A. 'T is hard to answer this Argument because I do not remember that there is any Argument for the maintenance of Vacuum in the writings of Divines Therefore I will quit that Argument and come to another If you take a Glass Vial with a narrow neck and having suckt it dip it presently at the neck into a bason of water you shall manifestly see the water rise into the Vial. Is not this a certain signe that you had suckt out some of the Air and consequently that some part of the Vial was left empty B. No For when I am about to suck and have Air in my mouth contracting my Cheeks I drive the same against the Air in the Glass and thereby against every part of the sides of the hard Glass And this gives to the Air within an Endeavour outward by which if it be presently dipt into the water it will penetrate and enter into it For Air if it be prest will enter into any Fluid much more into water Therefore there shall rise into the Vial so much water as there was Air forced into the Bason A. This I confess is possible and not improbable B. If sucking would make Vacuum what would become of those women that are Nurses Should they not be in a very few days exhausted were it not that either the Air which is in the Childs mouth penetrateth the Milk as it descends and passeth through it or the Breast is contracted A. From what Experiment can you evidently infer that there is no Vacuum B. From many and such as to almost all men are known and familiar If two hard Bodies flat and smooth be joyned together in a common Superficies parallel to the Horizontal Plain you cannot without great force pull them asunder if you apply your force perpendicularly to the common Superficies But if you place that common Superficies erect to the Horizon they will fall asunder with their own weight From whence I argue thus Since their Contiguity in what posture soever is the same and that they cannot be pull'd asunder by a perpendicular force without letting in the ambient Air in an instant which is impossible or almost in an instant which is difficult and on the other side when the common Superficies is erect the weight of the same hard Bodies are able to break the Contiguity and let in the Air successively it is manifest that the difficulty of Separation proceeds from this that neither Air nor any other Body can be moved to any how small soever distance in an instant but may easily be moved the hardness at the sides once mastered successively So that the Cause of this difficulty of Separation is this that they cannot be parted except the Air or other matter can enter and fill the space made by their diremption And if they were infinitely hard not at all And hence also you may understand the Cause why any hard Body when it is suddenly broken is heard to crack which is the swift Motion of the Air to fill the space between Another Experiment and commonly known is of a Barrel of Liquor whose Tap-hole is very little and the Bung so stopt as to admit no Air for then the Liquor will not run but if the Tap-hole be large it will because the Air prest by a heavier Bodie will pierce through it into the Barrel The like reason holds of a Gardeners Watering-pot when the holes in the bottom are not too great A third Experiment is this Turn a thin Brass kettle the bottom upwards and lay it flat upon the Water It will sink till the water rise within to a certain height but no higher Yet let the bottom be perforated and the Kettle will be full and sink and the Air rise again through the water without But if a Bell were so laid on it would be fill'd and sink though it were not perforated because the weight is greater than the weight of the same bulk of water A. By these Experiments without any more I am convinced that there is not actually in Nature any Vacuum but I am not sure but that there may be made some little place empty and this from two Experiments one whereof is Torricellius his Experiment which is this Take a Cylinder of Glass hollow throughout but close at the end in form of a Sack B. How long A. As long as you will so it be