The Notebooks of Leonardo Da Vinci

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Page 364 of 1565.
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OF THE DIFFERENT MEASUREMENTS OF BOYS AND MEN.

There is a great difference in the length between the joints in men
and boys for, in man, from the top of the shoulder [by the neck] to
the elbow, and from the elbow to the tip of the thumb and from one
shoulder to the other, is in each instance two heads, while in a boy
it is but one because Nature constructs in us the mass which is the
home of the intellect, before forming that which contains the vital
elements.

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