Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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1ſon of its great reſiſtance to the diviſion made by the hull of the
ſhip, doth with great noiſe reſiſt the ſame; nor doth it permit it
of a great while to acquire that velocity which the wind would
confer upon it, were the obſtacle of the water removed.

haps Simplicius you have never conſidered with what fury the
water beſets a bark, whil'ſt it forceth its way through a ſtanding
water by help of Oars or Sails: for if you had ever minded that
effect, you would not now have produced ſuch an abſurdity.
And I am thinking that you have hitherto been one of thoſe who
to find out how ſuch things ſucceed, and to come to the
ledg of natural effects, do not betake themſelves to a Ship, a
Croſſe-bow, or a piece of Ordinance, but retire into their
dies, and turn over Indexes and Tables to ſee whether Aristotle
hath ſpoken any thing thereof, and being aſſured of the true
ſenſe of the Text, neither deſire nor care for knowing any

The great
city for which they
are much to be
vied who perſwade
themſelves that
they know every
SAGR. This is a great felicity, and they are to be much
vied for it.
For if knowledg be deſired by all, and if to be wiſe,
be to think ones ſelf ſo, they enjoy a very great happineſſe, for
that they may perſwade themſelves that they know and underſtand
all things, in ſcorn of thoſe who knowing, that they underſtand
not what theſe think they underſtand, and conſequently ſeeking
that they know not the very leaſt particle of what is knowable,
kill themſelves with waking and ſtudying, and conſume their days
in experiments and obſervations.
But pray you let us return to
our birds; touching which you have ſaid, that the Air being
ved with great velocity, might reſtore unto them that part of the
diurnal motion which amongſt the windings of their flight they
might have loſt; to which I reply, that the agitated Air ſeemeth
unable to confer on a ſolid and grave body, ſo great a velocity as
its own: And becauſe that of the Air is as great as that of the
Earth, I cannot think that the Air is able to make good the loſſe
of the birds retardation in flight.
SALV. Your diſcourſe hath in it much of probability, and to
ſtick at trivial doubts is not for an acute wit; yet nevertheleſſe the
probability being removed, I believed that it hath not a jot more
force than the others already conſidered and reſolved.
SAGR. It is moſt certain that if it be not neceſſatily
dent, its efficacy muſt needs be juſt nothing at all, for it is
onely when the concluſion is neceſſary that the opponent hath
thing to alledg on the contrary.
SALV. Your making a greater ſcruple of this than of the other
inſtances dependeth, if I miſtake not, upon the birds being
mated, and thereby enabled to uſe their ſtrength at pleaſure
gainſt the primary motion in-bred in terrene bodies: like as for

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