OF PAINTING.

Indicate which are the muscles, and which the tendons, which become
prominent or retreat in the different movements of each limb; or
which do neither [but are passive]. And remember that these
indications of action are of the first importance and necessity in
any painter or sculptor who professes to be a master &c.

And indicate the same in a child, and from birth to decrepitude at
every stage of its life; as infancy, childhood, boyhood, youth &c.

And in each express the alterations in the limbs and joints, which
swell and which grow thinner.