Gelatine. This substance consists of that part of meat which, when extracted, forms a jelly when cold. It is found abundantly in the skins, flesh, and bones of all animals. Glue is a rough gelatine extracted from the skin, bones, and other parts of inferior animals - it is unsuited for food. The best gelatine for invalids is obtained from calves' feet, etc. It is both nutritive and strengthening.