Castelli, Benedetto, Of the mensuration of running waters, 1661

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              <s>
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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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                <emph type="italics"/>
              Brent
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              ſhall leave in the Lake in the ſpace of a year. </s>
              <s>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.</s>
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              <s>
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              Here are wanting
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              LETTERS
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              from ſeveral perſons.
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              </s>
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            <p type="head">
              <s>To the Reverend Father,
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              Franceſco di
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              </s>
            </p>
            <p type="head">
              <s>S. GIUSEPPE.</s>
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            <p type="main">
              <s>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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                <emph type="italics"/>
              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. </s>
              <s>and drained, to the great ſatisfaction of the Owners
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              of thoſe Grounds. </s>
              <s>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
                <emph.end type="italics"/>
              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,</s>
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            <p type="main">
              <s>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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                <emph type="italics"/>
              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 </s>
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          </chap>
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