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

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1very ſpeedily. And laſt of all theſe Diſcourſes and Reflections
upon the Menſuration of Running Waters, with the addition of
a Second Book, three Epiſtles, and four Conſiderations upon
the ſame Argument, which conduce much to Illuſtrate his Do­
ctrine and Facilitate the Practice of it; and which with a Rela­
tion of Monſignore Corſini, make the ſecond part of my Firſt
Tome.
§. I might here ſally forth into the Citation of ſundry Au­
thours of Good Account, that have tranſmitted his Character
to Poſterity, but ſhall confine my ſelf to onely two; the one is
of his Maſter, the other of his Scholar; than whom there can­
not be two more competent Judges of his Accompliſhments.
To
begin with his Maſter, the Quick-ſighted, and truly Lyncean
GALILEO, who ſpeaking of his Abilities in Aſtronomy ſaith

(a) Che la felicità del ſuo ingegno non la fà biſognoſa dell' o­
pera ſuo. And again, ſubmitting a certain Demonſtration,
which he intended to divulge, to the Judgment of this our Abbot, he

writes to him in this manner: (b) Queſto lo comunico a V. S.
per lettera prima che ad alcun altro, con attenderne principal­
mente il parer ſuo, e doppo quello de' noſtri Amici diſcoſti,
conpenſiero d' inviarne poi altre Copie ad altri Amici d' Italia,
e di Francia, quando io ne venga da lei conſigliato: e qui pre­
gandola a farci parte d' alcuna delle ſue peregrine ſpeculationi;
con ſinceriſſimo affetto, &c. And the moſt acute Mathematician
Signore Evangeliſta Terricelli, late Profeſſour to the Grand
Duke in immediate Succeſſion after GALILEO, maketh this

Honourable and Grateful Mention of him, and his Book: (c) O­
mitto magnum illum nutantis Maris motum; Prætereo etiam
omnem Fluminum, Aquarumque Currentium tum menſurum,
tum uſum, quarum omnis doctrina reperta primum fuit ab
Abbate BENEDICTO CASTELLIO Preceptore
meo.
Scripſit ille Scientiam ſuam, & illam non ſolum demonſtra­
tione, verum etiam opere confirmavit, maxima cum Princi­
pum & populorum utilitatate, majore cum admiratione Phylo­
ſophorum.
Extat illius Liber, vere aureus.
(a)Nella continu­
atione dell Nun­
tio ſiderio.
(b) Lettera al P.
Abbate D. B. Ca­
ſtelli D'Arcetro;
li.
3. Decemb.
1639.
(c) De Motu A­
quarum.
Lib. 2.
Prop.
37. p. 191.
§. I have onely two particulars more to offer the Engliſh Rea­
der: The one concerns the Book, and it is this, That after the
general Aprobation it hath had in Italy, I cannot but think it
deſerveth the ſame Civil Entertainment with us, in regard that
it cometh with no leſſe Novelty, Facility, Verity, and Utility to
us than to thoſe whom the Authour favoured with the Original.
Our Rivers and Sewers through Publique Diſtractions and Pri­
vate Incroachments are in great diſorder, as thoſe Channels for
iuſtance which formerly were Navigable unto the very Walls of

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