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“Bone collagen,” or “ossein,” constitutes, with calcium salts, the ground substance of bones.

Thus, a reproductive cell might have material particles as the rudiments for producing horn, chitin, chondrin, ossein, pigment, or chlorophyll, or for nerve-fibrils, muscle-fibrils; but not for producing a hair, or a separate ganglion of the spinal cord or the biceps muscle.

The organic portion of bones is almost entirely made up of a substance to which the name ossein has been given, and which, when boiled for a long time, is converted into gelatine.

This ossein, which forms on an average from 25 to 30 per cent of the weight of bones, is extremely rich in nitrogen, containing over 18 per cent.

This consists mainly of a substance called ossein, which may be dissolved out of the bones by boiling them.