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caustic soda solution, which is afterward treated in a known manner to refine it. What I claim is: 1. The process of making caustic soda b consisting in flowing molten sulfid of soda into water and thereby dissolving the sul- fid and adding thereto while hot, successive small portions of calcium hydrate in dilute solution. 10 2. The process of making caustic soda
consisting in flowing molten sulfid of sodium into water and thereby dissolving the sulfid and in adding to the hot solution, calcium hydrate. In testimony whereof I affix my signature ib in presence of two witnesses. JULES HECTOR HIRT. Witnesses: G. BTAIa, EDWARD E. BLAcK.