Yet another Jungle q

a palm is the width of four fingers
a foot is the width of four palms (i.e., 12 inches)
a cubit is the width of six palms
a man's height is four cubits (and thus 24 palms)
a pace is four cubits
the length of a man's outspread arms is equal to his height
the distance from the hairline to the bottom of the chin is one-tenth of a man's height
the distance from the top of the head to the bottom of the chin is one-eighth of a man's height
the maximum width of the shoulders is a quarter of a man's height
the distance from the elbow to the tip of the hand is one-fifth of a man's height
the distance from the elbow to the armpit is one-eighth of a man's height
the length of the hand is one-tenth of a man's height
the distance from the bottom of the chin to the nose is one-third of the length of the head
the distance from the hairline to the eyebrows is one-third of the length of the face
the length of the ear is one-third of the length of the face
The navel is naturally placed in the centre of the human body, and, if in a man lying with his face upward, and his hands and feet extended, from his navel as the centre, a circle be described, it will touch his fingers and toes. It is not alone by a circle, that the human body is thus circumscribed, as may be seen by placing it within a square. For measuring from the feet to the crown of the head, and then across the arms fully extended, we find the latter measure equal to the former; so that lines at right angles to each other, enclosing the figure, will form a square.

Whose theory is this.. Name the book if possible..