Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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tity of the Water that entereth into the Lake, by the means that
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I have ſhewen in the beginning of this Book: When he ſhall
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have found the proportion of the quantity of water to the quan
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tity of Sand or Mud, he ſhall come to know how much Sand the
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Brent
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ſhall leave in the Lake in the ſpace of a year. </
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>But to
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perform theſe things, there are required perſons of diſcretion, and
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fidelity, and that are imployed by publick Order; for there
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would thence reſult eminent benefit and profit.</
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Here are wanting
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LETTERS
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from ſeveral perſons.
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<
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>To the Reverend Father,
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Franceſco di
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>S. GIUSEPPE.</
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>In execution of the command that you laid upon me in your
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former Letters, by order from the moſt Serene, my Lord,
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Prince Leopold
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; that I ſhould ſpeak my judgment concern
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ing the diſimboguement of the River called
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Fiume morto,
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whe
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ther it ought to be let into the Sea, or into
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Serchio
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; I ſay, that
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I chanced 18. years ſince to be preſent, when the ſaid Mouth was
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opened into the Sea, and that of
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Serchio
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ſtopt; which work was
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done to remedy the great Innundation that was made in all that
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Country, and Plain of
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Piſa,
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that lyeth between the River
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Arno,
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and the Mountains of
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S. Giuliano,
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and the River
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Serchio
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; which
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Plain continued long under water, inſomuch that not onely in the
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Winter, but alſo for a great part of the Summer, thoſe fields
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were overflowed; and when that the Mouth of
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Fiume morto
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was
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effectually opened into the Sea, the place was preſently freed from
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the waters. </
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>and drained, to the great ſatisfaction of the Owners
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of thoſe Grounds. </
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>And here I judge it worth your notice, that
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for the generality of thoſe that poſſeſs eſtates in thoſe parts, they
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deſired that the Mouth of
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Fiume morto
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might ſtand open to the
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Sea, and thoſe who would have it open into
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Serchio,
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are perſons
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that have no other concernment there, ſave the hopes of gaining
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by having the diſpoſe of Commiſſions, and the like, &c,</
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>But for the more plain underſtanding of that which is to be
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ſaid, it muſt be known, That the reſolution of opening the ſaid
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Mouth into
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Serchio,
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was taken in the time of the Great Duke
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Ferdinando
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the firſt, upon the ſame motives that are at this time
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again propoſed, as your Letters tell me, Since that, it manifeſt
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ly appearing, that
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Fiume morto
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had, and hath its Mouth open to
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the Sea, the Plain hathbeen kept dry; and it being alſo true, that </
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