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THE treatise of Theophifus Presbyter, entitled “Diversarum Artium Schedula,” and well known to all students of the history of painting, gives directions for the preparation and use of glues from leather and deers' antlers, of plumand cherry-gums, and of mixtures of cheese and lime described as “cheese glues.” This list of adhesives familiar to craftsmen at the end of the eleventh century covers practically all the types in use at the beginning of the twentieth century. A similar degree of old empirical perfection is shown by many arts employing colloidal material, and the student of colloid chemistry anxious to magnify his office is perpetually confronted with the task of explaining the rationale of traditional procedure and of suggesting improvements based on theoretical grounds.

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