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Among the patents recently issued in England is one obtained by D. Lichtenstadt for making pulp for paper and other fabrics from leather, or any kind of animal fibrine, whether in large or small pieces, shavings, or shreds, either tanned or untanned. When in the tanned state, in order to extract the tannin, he treats it with caustic lime, or limy matter mixed with sal ammoniac, ammonia, or ammoniacal compounds, and afterwards washes it successively in an acid liquid and water to remove the caustic liquor, when it is pressed and dried, and converted into pulp in the usual way. In case the animal fibrine is not tanned it is first cleaned by being mixed for about two hours in a composition of water, caustic lime, and potash, then washed in cold water, and mixed with gypsum, or alumina, when it is ready for the pulping engine.
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