The Notebooks of Leonardo Da Vinci Complete


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VI.  
GEOLOGICAL PROBLEMS.  
9
85.  
In this work you have first to prove that the shells at a thousand  
braccia of elevation were not carried there by the deluge, because  
they are seen to be all at one level, and many mountains are seen to  
be above that level; and to inquire whether the deluge was caused by  
rain or by the swelling of the sea; and then you must show how,  
neither by rain nor by swelling of the rivers, nor by the overflow  
of this sea, could the shells--being heavy objects--be floated up  
the mountains by the sea, nor have carried there by the rivers  
against the course of their waters.  
Doubts about the deluge.  
9
86.  
A DOUBTFUL POINT.  
Here a doubt arises, and that is: whether the deluge, which happened  
at the time of Noah, was universal or not. And it would seem not,  
for the reasons now to be given: We have it in the Bible that this  
deluge lasted 40 days and 40 nights of incessant and universal rain,  
803  


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