ch side.
Forefoot 40--20 on each side.
Pelvis 2-- 1 on each side.
Thigh 2-- 1 on each side.
Leg 6-- 3 on each side.
Hind foot 38--19 on each side.
----
Total 196

Without attempting to burden the reader with the technical names and a
scientific classification of each, it appears desirable to describe some of
the characteristics of forms in general and of a few classes into which
they may be divided, leaving the special study of individual bones to the
illustrations of the skeleton (Pl. XXV), which will serve better than a
great deal of writing to fix in the mind of the reader the location,
relation, and function of each one. In early fetal life the place of bone
is supplied by temporary cartilage, which gradually changes to bone. For
convenience of study, bones may be said to be composed of a form of dense
connective tissue impregnated with lime salts and to contain two elementary
constituents--the organic or animal and the inorganic or earthy. In young
animals the former predominates; with increasing years the relative
proportions of the two change, so that when advanced age is reached the
proportion of inorganic far exceeds the organic. The gradual change with
advancing years from organic to inorganic has the effect of rendering the
bone harder and more brittle, and though it is stronger, the reparative
process is slower when injury does occur.

The bones are nourished in two ways: First, from the outside through their
covering, called the periosteum--the thin, strong membrane that covers
every part of the bone except the articular surface of the joints; and,
second, from within through the minute branches of blood vessels which pass
into the bones through holes (foramina) on their surface and are
distributed in the soft structure (medulla) of the inside. The structure of
the bone is divided into two parts--the compact or hard material of the
outside, which gives strength and is more abundant in the shafts of long
bones, and the cancellated, softer tissue of the inside, which affords
accommodation to the blood vessels necessary for the nourishment of that
part of the structure.

In shape, bones are divided into three classes--long, flat, and short. The
long bones are the ribs and those mostly found in the limbs; the flat bones
are found in the head, the shoulder, and the pelvis; the short bones in the
spinal column and in the low