Vitruvius, the architect, says in his work on architecture that the
measurements of the human body are distributed by Nature as follows:
that is that 4 fingers make 1 palm, and 4 palms make 1 foot, 6 palms
make 1 cubit; 4 cubits make a man's height. And 4 cubits make one
pace and 24 palms make a man; and these measures he used in his
buildings. If you open your legs so much as to decrease your height
1/14 and spread and raise your arms till your middle fingers touch
the level of the top of your head you must know that the centre of
the outspread limbs will be in the navel and the space between the
legs will be an equilateral triangle.

The length of a man's outspread arms is equal to his height.

From the roots of the hair to the bottom of the chin is the tenth of
a man's height; from the bottom of the chin to the top of his head
is one eighth of his height; from the top of the breast to the top
of his head will be one sixth of a man. From the top of the breast
to the roots of the hair will be the seventh part of the whole man.
From the nipples to the top of the head will be the fourth part of a
man. The greatest width of the shoulders contains in itself the
fourth part of the man. From the elbow to the tip of the hand will
be the fifth part of a man; and from the elbow to the angle of the
armpit will be the eighth part of the man. The whole hand will be
the tenth part of the man; the beginning of the genitals marks the
middle of the man. The foot is the seventh part of the man. From the
sole of the foot to below the knee will be the fourth part of the
man. From below the knee to the beginning of the genitals will be
the fourth part of the man. The distance from the bottom of the chin
to the nose and from the roots of the hair to the eyebrows is, in
each case the same, and like the ear, a third of the face.

[Footnote: See Pl. XVIII. The original leaf is 21 centimetres wide
and 33 1/2 long. At the ends of the scale below the figure are
written the words _diti_ (fingers) and _palmi_ (palms). The passage
quoted from Vitruvius is Book III, Cap. 1, and Leonardo's drawing is
given in the editions of Vitruvius by FRA GIOCONDO (Venezia 1511,
fol., Firenze 1513, 8vo.) and by CESARIANO (Como 1521).]

The arm and head.

344.

From _b_ to _a_ is one head, as well as from _c_ to _a_ and this
happens when the elbow forms a right angle.

[Footnote: See Pl. XLI, No. 1.]

Proportions of the arm (345-349).

345.

From the tip of the longest finger of the hand to the shoulder joint
is four hands or, if you will, four faces.

_a b c_ are equal and each interval is 2 heads.

[Footnote: Lines 1-3 are given on Pl. XV below the front view of the
leg; lines 4 and 5 are below again, on the left side. The lettering
refers to the bent arm near the text.]

346.

The hand from the longest finger to the wrist joint goes 4 times
from the tip of the longest finger to the shoulder joint.

347.

_a b c_ are equal to each other and to the foot and to the space
between the nipple and the navel _d e_ will be the third part of the
whole man.

_f g_ is the fourth part of a man and is equal to _g h_ and measures
a cubit.

[Footnote: See Pl. XIX, No. 1. 1. _mamolino_ (=_bambino_, little
child) may mean here the navel.]

348.

_a b_ goes 4 times into _a c_ and 9 into _a m_. The greatest
thickness of the arm between the elbow and the hand goes 6 times
into _a m_ and is equal to _r f_. The greatest thickness of the arm
between the shoulder and the elbow goes 4 times into _c m_, and is
equal to _h n g_. The smallest thickness of the arm above the elbow
_x y_ is not the base of a square, but is equal to half the space
_h_ 3 which is found between the inner joint of the arm and the
wrist joint.

[11]The width of the wrist goes 12 times into the whole arm; that is
from the tip of the fingers to the shoulder joint; that is 3 times
into the hand and 9 into the arm.

The arm when bent is 4 heads.

The arm from the shoulder to the elbow in bending increases in
length, that is in the length from the shoulder to the elbow, and
this increase is equal to the thickness of the arm at the wrist when
seen in profile. And the space between the bottom of the chin and
the parting of the lips, is equal to the thickness of the 2 middle
fingers, and to the width of the mouth and to the space between the


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