/ I. Thigh Femur.
/
| / Patella,
The Lower Limbs | II. Lower Leg | Tibia,
(60 bones). | \ Fibula.
|
| / 7 Tarsal Bones,
\ III. Foot | 5 Metatarsal Bones,
\ \ 14 Phalanges.





Chapter III.

The Muscles.



64. Motion in Animals. All motion of our bodies is produced by means
of muscles. Not only the limbs are moved by them, but even the movements
of the stomach and of the heart are controlled by muscles. Every part of
the body which is capable of motion has its own special set of muscles.

Even when the higher animals are at rest it is possible to observe some
kind of motion in them. Trees and stones never move unless acted upon by
external force, while the infant and the tiniest insect can execute a
great variety of movements. Even in the deepest sleep the beating of the