SOURCE.—The skeleton of vertebrate animals.
CONSTITUENTS.—Calcium phosphate 40 to 67 per cent., which
includes a small percentage of calcium carbonate; phosphates of
magnesium and other salts are also present. With the salts are
also found organic substances yielding gelatine on boiling with
water. The basic substance of the bony structure contains two
chief constituents, namely, an organic substance, ossein, and
the so-called bone earth inclosed in or combined with it. Ossein
is generally considered identical with collagin of the
connective tissue. Preparation of Ossein: that portion of bone
that is left undissolved after treatment with HCl. USES.—For
preparing bone-black, animal charcoal, and phosphates. A Manual
of Organic Materia Medica and Pharmacognosy, 1917, was written
by Lucius E. Sayre, B.S. Ph. M.