In kneeling down a man will lose the fourth part of his height.

When a man kneels down with his hands folded on his breast the navel
will mark half his height and likewise the points of the elbows.

Half the height of a man who sits--that is from the seat to the top
of the head--will be where the arms fold below the breast, and
below the shoulders. The seated portion--that is from the seat to
the top of the head--will be more than half the man's [whole height]
by the length of the scrotum.

[Footnote: See Pl. VIII, No. 2.]

The relative proportions of the torso and of the whole figure.