The Notebooks of Leonardo Da Vinci Complete


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9
55.  
Where there is a larger quantity of water, there is a greater flow  
and ebb, but the contrary in narrow waters.  
Look whether the sea is at its greatest flow when the moon is half  
way over our hemisphere [on the meridian].  
9
56.  
Whether the flow and ebb are caused by the moon or the sun, or are  
the breathing of this terrestrial machine. That the flow and ebb are  
different in different countries and seas.  
[Footnote: 1. Allusion may here be made to the mythological  
explanation of the ebb and flow given in the Edda. Utgardloki says  
to Thor (Gylfaginning 48): "When thou wert drinking out of the horn,  
and it seemed to thee that it was slow in emptying a wonder befell,  
which I should not have believed possible: the other end of the horn  
lay in the sea, which thou sawest not; but when thou shalt go to the  
sea, thou shalt see how much thou hast drunk out of it. And that men  
now call the ebb tide."  
Several passages in various manuscripts treat of the ebb and flow.  
In collecting them I have been guided by the rule only to transcribe  
those which named some particular spot.]  
783  


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