The Principles of Leather ManufactureNote 158 — Chapter XXII · THE EXTRACTION OF TANNING MATERIALS, AND THE MAKING OF EXTRACTS.Reading editionLepetit, Dollfus, and Gansser, Eng. Pat. 8582, 1896.◇Copy noteReturn to CHAPTER XXII. THE EXTRACTION OF TANNING MATERIALS, AND THE MAKING OF EXTRACTS.