Galilei, Galileo
,
The systems of the world
,
1661
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ſon of its great reſiſtance to the diviſion made by the hull of the
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ſhip, doth with great noiſe reſiſt the ſame; nor doth it permit it
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of a great while to acquire that velocity which the wind would
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confer upon it, were the obſtacle of the water removed. </
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haps
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Simplicius
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you have never conſidered with what fury the
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water beſets a bark, whil'ſt it forceth its way through a ſtanding
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water by help of Oars or Sails: for if you had ever minded that
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effect, you would not now have produced ſuch an abſurdity.
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<
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>And I am thinking that you have hitherto been one of thoſe who
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to find out how ſuch things ſucceed, and to come to the
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ledg of natural effects, do not betake themſelves to a Ship, a
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Croſſe-bow, or a piece of Ordinance, but retire into their
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dies, and turn over Indexes and Tables to ſee whether
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Aristotle
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hath ſpoken any thing thereof, and being aſſured of the true
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ſenſe of the Text, neither deſire nor care for knowing any
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The great
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city for which they
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are much to be
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vied who perſwade
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themſelves that
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they know every
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thing.
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<
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>SAGR. </
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>This is a great felicity, and they are to be much
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vied for it. </
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>For if knowledg be deſired by all, and if to be wiſe,
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be to think ones ſelf ſo, they enjoy a very great happineſſe, for
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that they may perſwade themſelves that they know and underſtand
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all things, in ſcorn of thoſe who knowing, that they underſtand
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not what theſe think they underſtand, and conſequently ſeeking
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that they know not the very leaſt particle of what is knowable,
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kill themſelves with waking and ſtudying, and conſume their days
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in experiments and obſervations. </
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<
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>But pray you let us return to
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our birds; touching which you have ſaid, that the Air being
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ved with great velocity, might reſtore unto them that part of the
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diurnal motion which amongſt the windings of their flight they
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might have loſt; to which I reply, that the agitated Air ſeemeth
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unable to confer on a ſolid and grave body, ſo great a velocity as
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its own: And becauſe that of the Air is as great as that of the
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Earth, I cannot think that the Air is able to make good the loſſe
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of the birds retardation in flight.</
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<
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>SALV. </
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<
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>Your diſcourſe hath in it much of probability, and to
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ſtick at trivial doubts is not for an acute wit; yet nevertheleſſe the
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probability being removed, I believed that it hath not a jot more
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force than the others already conſidered and reſolved.</
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<
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>SAGR. </
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<
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>It is moſt certain that if it be not neceſſatily
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dent, its efficacy muſt needs be juſt nothing at all, for it is
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onely when the concluſion is neceſſary that the opponent hath
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thing to alledg on the contrary.</
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<
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>SALV. </
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<
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>Your making a greater ſcruple of this than of the other
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inſtances dependeth, if I miſtake not, upon the birds being
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mated, and thereby enabled to uſe their ſtrength at pleaſure
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gainſt the primary motion in-bred in terrene bodies: like as for </
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