The Notebooks of Leonardo Da Vinci Complete


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and returns by the same descent, thus rising from the inside to the  
outside, and going round from the lowest to the highest, from whence  
it rushes down in a natural course. Thus by these two movements  
combined in a constant circulation, it travels through the veins of  
the earth.  
9
66.  
WHETHER WATER RISES FROM THE SEA TO THE TOPS OF MOUNTAINS.  
The water of the ocean cannot make its way from the bases to the  
tops of the mountains which bound it, but only so much rises as the  
dryness of the mountain attracts. And if, on the contrary, the rain,  
which penetrates from the summit of the mountain to the base, which  
is the boundary of the sea, descends and softens the slope opposite  
to the said mountain and constantly draws the water, like a syphon  
[Footnote 11: Cicognola, Syphon. See Vol. I, Pl. XXIV, No. 1.] which  
pours through its longest side, it must be this which draws up the  
water of the sea; thus if s n were the surface of the sea, and the  
rain descends from the top of the mountain a to n on one side,  
and on the other sides it descends from a to m, without a doubt  
this would occur after the manner of distilling through felt, or as  
happens through the tubes called syphons [Footnote 17: Cicognola,  
Syphon. See Vol. I, Pl. XXIV, No. 1.]. And at all times the water  
which has softened the mountain, by the great rain which runs down  
the two opposite sides, would constantly attract the rain a n, on  
790  


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