WATER.

OF THE MOVEMENT OF A SUDDEN RUSH MADE BY A RIVER IN ITS BED
PREVIOUSLY DRY.

In proportion as the current of the water given forth by the
draining of the lake is slow or rapid in the dry river bed, so will
this river be wider or narrower, or shallower or deeper in one place
than another, according to this proposition: the flow and ebb of the
sea which enters the Mediterranean from the ocean, and of the rivers
which meet and struggle with it, will raise their waters more or
less in proportion as the sea is wider or narrower.

[Footnote: In the margin is a sketch of a river which winds so as to
form islands.]

Whirlpools.