Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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>The anſwer to a Letter written by BAR
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TOLOTTI, touching the
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difficultyes obſerved.</
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The former part of the Letter is omitted, and the diſcourſe
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beginneth at the firſt Head.
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>And firſt I ſay, Whereas I ſuppoſe that the level of the
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Ser
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chio
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is higher than that of
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Fiume morto
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; this is moſt true,
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at ſuch time as the waters of
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Fiume morto
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are diſcharged in
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to the Sea; but I did never ſay that things could never be brought
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to that paſs, as that the level of
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Fiume morto
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ſhould be higher than
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Serchio
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: and ſo I grant that it will follow, that the waters of
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Fiume morto
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ſhall go into
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Serchio,
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and its very poſſible, that the
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Drain of
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Fiume morto
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into
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Serchio
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may be continuate; and I far
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ther grant, that its poſſible, that the
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Serchio
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doth never diſgorge
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thorow
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Fiume morto
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towards
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Piſa
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; Nay, I will yet farther grant
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that it might have happened, that
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Fiume morto
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might have had
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ſuch a fall into
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Serchio,
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as would have ſufficed to have turned
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Mills: But then I add withall, that the Plains of
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Piſa,
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and the
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City it ſelf muſt be a meer Lake.</
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>2.
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Signore Bartololti
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ſaith confidently, that when the Sea ſwel
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leth by the South-Weſt, or other Winds, the level of
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Serchio
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in
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the place marked A in the Platt, diſtant about 200. Braces, riſeth
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very little: But that
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Fiume morto
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in D, and in E, many miles
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more up into Land riſeth very much, and that certain Fiſhermen
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confirm this, and ſhew him the ſignes of the riſing of the Water.
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>I grant it to be very true, and I have ſeen it with my own eyes:
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But this cometh to paſs, when the Mouth of
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Fiume morto
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is ſtopt
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up by the Sea; as I ſhall ſhew by and by. </
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>And this riſing near
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the Sea-ſide, is of no conſiderable prejudice to the fields. </
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>And
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this is as much as I find to be true in the aſſertion of
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Signore Bar
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tolotti,
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(without his confirming it by any other proof; as indeed
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it needs none) That the level of
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Fiume morto
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riſeth in E, and ma
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ny miles farther upwards it riſeth much; nor did I ever affirm the
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contrary.</
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<
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>3. Concerning the difficulty of opening the Mouth of
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Fiume
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morto
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into the Sea, that which
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Il Caſtellano
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ſaith is moſt certain;
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namely, That at the entrance upon the opening of the Mouth, it
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is neceſſary to make a deep Trench: But I ſay, that at that time
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it is difficult to open it, unleſs upon great occaſions; for that the </
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