Galilei, Galileo
,
The systems of the world
,
1661
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is corrupted, reſides it in the ſame Earth or in ſome other bodie,
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which muſt either be the Air or Water? </
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<
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>I believe you will grant,
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that like as the Motions upwards and downwards, and gravity
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and levity, which you make the firſt contraries, cannot be in the
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ſame Subject, ſo neither can moiſt and dry, hot and cold: you
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muſt therefore conſequently acknowledg that when a bodie
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rupteth, it is occaſioned by ſome quality reſiding in another
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trary to its own: therefore to make the Cœleſtial Body become
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corruptible, it ſufficeth that there are in Nature, bodies that have
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a contrariety to that Cœleſtial body; and ſuch are the Elements,
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if it be true that corruptibility be contrary to incorruptibility.</
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Contraries which
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are the cauſes of
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corruption, reſide
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not in the ſame
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dy that corrupteth.
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<
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>SIMPL. </
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>This ſufficeth not, Sir; The Elements alter and
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rupt, becauſe they are intermixed, and are joyn'd to one another,
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and ſo may exerciſe their contrariety; but Cœleſtial bodies are
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ſeparated from the Elements, by which they are not ſo much as
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toucht, though indeed they have an influence upon the Elements.
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<
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>It is requiſite, if you will prove generation and corruption in
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leſtial bodies, that you ſhew, that there reſides contrarieties
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tween them.</
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Cœleſtial Bodies
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touch, but are not
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touched by the
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lements.
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<
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>SAGR. </
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<
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>See how I will find thoſe contrarieties between them.
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<
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>The firſt fountain from whence you derive the contrariety of the
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Elements, is the contrariety of their motions upwards and
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wards: it therefore is neceſſary that thoſe Principles be in like
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manner contraries to each other, upon which thoſe motions
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pend. </
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<
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>and becauſe that is moveable upwards by lightneſs,
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and this downwards by gravitv, it is neceſſary that lightneſs and
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gravity are contrary to each other: no leſs are we to believe thoſe
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other Principles to be contraries, which are the cauſes that this is
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heavy, and that light: but by your own confeſſion, levity and
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gravity follow as conſequents of rarity and denſity; therefore
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rarity and denſity ſhall be contraries: the which conditions or
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affections are ſo amply found in Cœleſtial bodies, that you
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ſteem the ſtars to be onely more denſe parts of their Heaven:
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and if this be ſo, it followeth that the denſity of the ſtars exceeds
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that of the reſt of Heaven, by almoſt infinite degrees:
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which is manifeſt, in that Heaven is infinitely tranſparent, and
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the ſtars extremely opacous; and for that there are there above
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no other qualities, but more and leſs denſity and rarity, which
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may be cauſes of the greater or leſs tranſparency. </
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<
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>There being
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then ſuch contrariety between the Cœleftial bodies, it is neceſſary
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that they alſo be generable and corruptible, in the ſame manner
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as the Elementary bodies are; or elſe that contrariety is not the
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cauſe of corruptibility,
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&c.
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Gravity & levity,
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varity and denſity,
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are contrary
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lities.
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The ſtars infinitely
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ſurpaſs the
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ſtance of the reſt of
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Heaven in denſity.
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Rarity & denſity
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in Cœleſtial bodies,
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is different from
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the rarity &
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ſity of the elements.
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<
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>SIMPL. </
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<
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>There is no neceſſity either of one or the other, for
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that denſity and rarity in Cœleſtial bodies, are not contraries to </
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