The nose will make a double square; that is the width of the nose at
the nostrils goes twice into the length from the tip of the nose to
the eyebrows. And, in the same way, in profile the distance from the
extreme side of the nostril where it joins the cheek to the tip of
the nose is equal to the width of the nose in front from one nostril
to the other. If you divide the whole length of the nose--that is
from the tip to the insertion of the eyebrows, into 4 equal parts,
you will find that one of these parts extends from the tip of the
nostrils to the base of the nose, and the upper division lies
between the inner corner of the eye and the insertion of the
eyebrows; and the two middle parts [together] are equal to the
length of the eye from the inner to the outer corner.

[Footnote: The two bottom sketches on Pl. VII, No. 4 face the six
lines of this section,--With regard to the proportions of the head
in profile see No. 312.]