The Notebooks of Leonardo Da Vinci Complete


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[
Footnote: The peculiar use of the words nervo, muscolo,  
corda, senso comune, which are here literally rendered by nerve,  
muscle cord or tendon and Common Sense may be understood from lines  
2
7 and 28.]  
On involuntary muscular action.  
8
39.  
HOW THE NERVES SOMETIMES ACT OF THEMSELVES WITHOUT ANY  
COMMANDS FROM  
THE OTHER FUNCTIONS OF THE SOUL.  
This is most plainly seen; for you will see palsied and shivering  
persons move, and their trembling limbs, as their head and hands,  
quake without leave from their soul and their soul with all its  
power cannot prevent their members from trembling. The same thing  
happens in falling sickness, or in parts that have been cut off, as  
in the tails of lizards. The idea or imagination is the helm and  
guiding-rein of the senses, because the thing conceived of moves the  
sense. Pre-imagining, is imagining the things that are to be.  
Post-imagining, is imagining the things that are past.  
Miscellaneous physiological observations (840-842).  
8
40.  
691  


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