Читать книгу A Text-book of Paper-making - C. F. Cross - Страница 7

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—The mantles of many of the mollusca, e.g. the Pyrosomidæ, Salpidæ, and Phallusia mammillaris, contain a resistant substance which, after isolation by chemical treatment, has been found to be identical both in composition and properties with vegetable cellulose. Cellulose has also been stated to occur in degenerated human spleen and in certain parts of the brain.