The great toe is the sixth part of the foot, taking the measure in
profile, on the inside of the foot, from where this toe springs from
the ball of the sole of the foot to its tip _a b_; and it is equal
to the distance from the mouth to the bottom of the chin. If you
draw the foot in profile from the outside, make the little toe begin
at three quarters of the length of the foot, and you will find the
same distance from the insertion of this toe as to the farthest
prominence of the great toe.