969

Observations in support of the hypothesis.

That many springs of salt water are found at great distances from the sea; this might happen because such springs pass through some mine of salt, like that in Hungary where salt is hewn out of vast caverns, just as stone is hewn.

[Footnote: The great mine of Wieliczka in Galicia, out of which a million cwt. of rock-salt are annually dug out, extends for 3000 metres from West to East, and 1150 metres from North to South.]

IV.

OF RIVERS.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

Notebooks of Leonoardo da Vinci

XVI: Physical Geography.

. . .

On the formation of Gulfs.

950,

On the encroachments of the sea on the land and vice versa.

952,

953,

The ebb and flow of the tide.

955,

956,

957,

958,

959,

Theory of the circulation of the waters.

961,

Observations in support of the hypothesis.

963,

964,

965,

966,

967,

968,

On the way in which the sources of rivers are fed.

The tide in estuaries.

confluence.

972,

973,

Whirlpools.

On the alterations in the channels of rivers.

The origin of the sand in rivers.

977,

The formation of mountains.

979,

980,

981,

982,

The authorities for the study of the structure of the earth.

984,

Doubts about the deluge.

That marine shells could not go up the mountains.

The marine shells were not produced away from the sea.

Further researches.

. . .