The Notebooks of Leonardo Da Vinci Complete


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SUBTERRANEAN WATER COURSES.  
Theory of the circulation of the waters (961. 962).  
9
61.  
Very large rivers flow under ground.  
9
62.  
This is meant to represent the earth cut through in the middle,  
showing the depths of the sea and of the earth; the waters start  
from the bottom of the seas, and ramifying through the earth they  
rise to the summits of the mountains, flowing back by the rivers and  
returning to the sea.  
Observations in support of the hypothesis (963-969).  
9
63.  
The waters circulate with constant motion from the utmost depths of  
the sea to the highest summits of the mountains, not obeying the  
nature of heavy matter; and in this case it acts as does the blood  
of animals which is always moving from the sea of the heart and  
flows to the top of their heads; and here it is that veins burst--as  
788  


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