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Mugnone.]
9
73.
When the fulness of rivers is diminished, then the acute angles
formed at the junction of their branches become shorter at the sides
and wider at the point; like the current a n and the current d
n, which unite in n when the river is at its greatest fulness. I
say, that when it is in this condition if, before the fullest time,
d n was lower than a n, at the time of fulness d n will be
full of sand and mud. When the water d n falls, it will carry away
the mud and remain with a lower bottom, and the channel a n
finding itself the higher, will fling its waters into the lower, d
n, and will wash away all the point of the sand-spit b n c, and
thus the angle a c d will remain larger than the angle a n d and
the sides shorter, as I said before.
[Footnote: Above the first sketch we find, in the original, this
note: "Sopra il pote rubaconte alla torricella"; and by the
second, which represents a pier of a bridge, "Sotto l'ospedal del
ceppo."]
9
74.
WATER.
796
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