The Notebooks of Leonardo Da Vinci Complete


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where the current is impeded; it behaves as it does where it is  
reduced in width to pass under the arches of a bridge.  
Further researches (989-991).  
9
89.  
A CONFUTATION OF THOSE WHO SAY THAT SHELLS MAY HAVE BEEN  
CARRIED TO  
A DISTANCE OF MANY DAYS' JOURNEY FROM THE SEA BY THE DELUGE,  
WHICH  
WAS SO HIGH AS TO BE ABOVE THOSE HEIGHTS.  
I say that the deluge could not carry objects, native to the sea, up  
to the mountains, unless the sea had already increased so as to  
create inundations as high up as those places; and this increase  
could not have occurred because it would cause a vacuum; and if you  
were to say that the air would rush in there, we have already  
concluded that what is heavy cannot remain above what is light,  
whence of necessity we must conclude that this deluge was caused by  
rain water, so that all these waters ran to the sea, and the sea did  
not run up the mountains; and as they ran to the sea, they thrust  
the shells from the shore of the sea and did not draw them to wards  
themselves. And if you were then to say that the sea, raised by the  
rain water, had carried these shells to such a height, we have  
already said that things heavier than water cannot rise upon it, but  
remain at the bottom of it, and do not move unless by the impact of  
811  


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