The Notebooks of Leonardo Da Vinci Complete


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water upon it just as we see the moon, and the earth would light it  
as it lights us.  
The fundamental laws of the solar system (859-864).  
8
59.  
Force arises from dearth or abundance; it is the child of physical  
motion, and the grand-child of spiritual motion, and the mother and  
origin of gravity. Gravity is limited to the elements of water and  
earth; but this force is unlimited, and by it infinite worlds might  
be moved if instruments could be made by which the force could be  
generated.  
Force, with physical motion, and gravity, with resistance are the  
four external powers on which all actions of mortals depend.  
Force has its origin in spiritual motion; and this motion, flowing  
through the limbs of sentient animals, enlarges their muscles. Being  
enlarged by this current the muscles are shrunk in length and  
contract the tendons which are connected with them, and this is the  
cause of the force of the limbs in man.  
The quality and quantity of the force of a man are able to give  
birth to other forces, which will be proportionally greater as the  
motions produced by them last longer.  
704  


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