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[5]a e is equal to the palm of the hand, r f and o g are equal
to half a head and each goes 4 times into a b and b c. From c
to m is 1/2 a head; m n is 1/3 of a head and goes 6 times into
c b and into b a; a b loses 1/7 of its length when the arm is
extended; c b never alters; o will always be the middle point
between a and s.
y l is the fleshy part of the arm and measures one head; and when
the arm is bent this shrinks 2/5 of its length; o a in bending
loses 1/6 and so does o r.
a b is 1/7 of r c. f s will be 1/8 of r c, and each of those
2
measurements is the largest of the arm; k h is the thinnest part
between the shoulder and the elbow and it is 1/8 of the whole arm r
c; o p is 1/5 of r l; c z goes 13 times into r c.
[
Footnote: See Pl. XX where the text is also seen from lines 5-23.]
The movement of the arm (350-354).
3
50.
In the innermost bend of the joints of every limb the reliefs are
converted into a hollow, and likewise every hollow of the innermost
bends becomes a convexity when the limb is straightened to the
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