The Notebooks of Leonardo Da Vinci Complete


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9
35.  
OF THE SEA WHICH CHANGES THE WEIGHT OF THE EARTH.  
The shells, oysters, and other similar animals, which originate in  
sea-mud, bear witness to the changes of the earth round the centre  
of our elements. This is proved thus: Great rivers always run  
turbid, being coloured by the earth, which is stirred by the  
friction of their waters at the bottom and on their shores; and this  
wearing disturbs the face of the strata made by the layers of  
shells, which lie on the surface of the marine mud, and which were  
produced there when the salt waters covered them; and these strata  
were covered over again from time to time, with mud of various  
thickness, or carried down to the sea by the rivers and floods of  
more or less extent; and thus these layers of mud became raised to  
such a height, that they came up from the bottom to the air. At the  
present time these bottoms are so high that they form hills or high  
mountains, and the rivers, which wear away the sides of these  
mountains, uncover the strata of these shells, and thus the softened  
side of the earth continually rises and the antipodes sink closer to  
the centre of the earth, and the ancient bottoms of the seas have  
become mountain ridges.  
9
36.  
768  


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