The cubit is one fourth of the height of a man and is equal to the
greatest width of the shoulders. From the joint of one shoulder to
the other is two faces and is equal to the distance from the top of
the breast to the navel. [Footnote 9: _dalla detta somita_. It would
seem more accurate to read here _dal detto ombilico_.] From this
point to the genitals is a face's length.

[Footnote: Compare with this the sketches on the other page of the
same leaf. Pl. VIII, No. 2.]

The relative proportions of the head and of the torso.