997

On the motion of air.

The element of fire acts upon a wave of air in the same way as the air does on water, or as water does on a mass of sand —that is earth; and their motions are in the same proportions as those of the motors acting upon them.

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

996 * 998

XIV * XVII

Notebooks of Leonoardo da Vinci

XVI: Physical Geography.

. . .

The origin of the sand in rivers.

977,

978

The formation of mountains.

979,

980,

981,

982,

983

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

984,

985

Doubts about the deluge.

986

That marine shells could not go up the mountains.

987

The marine shells were not produced away from the sea.

988

Further researches.

989,

990,

991