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It may contain mucin, chondrin, or gelatin, and may be infiltrated with calcareous salts.

Neither glutin nor chondrin occurs ready formed in the animal kingdom, but they separate when the tissues are boiled with water.

They yield chitin in place of chondrin or gelatin—as does also the cartilage of the Cephalopod’s endoskeleton.

The chondrin which I used acted more powerfully than gelatine, but then I do not know that it was pure.

All the liquefied chondrin was by this time absorbed.