tion. THE PROGRESS OF FISH CULTURE IN NEW YORK. The Production of Chlorine and Hypochloritee. the presence of certain metallic peroxides or dehydrating salts have never given practically valuable results because the excess of oxygen or air and nitrogen mixed with the chlorine generated partly prevents the condensation of this chlorine or its combination with the alkalies and alkaline earthy bodies intended to produce hypochlorites suitable for practical use in bleaching. The object of M. Tessie du Motay's process is while wholly or partially utilizing the hydrochloric acid era ployed to generate pure chlorine in an isolated state which can combine without waste with the alkaline or alkalino-ter rous bodies in the form of bleaching chlorides ; and to ac complish this the inventor has discovered two methods : 1. Into a retort heated to a deep red containing peroxide of manganese or a mixture of peroxide of manganese and lime a current of hydrochloric acid is caused to pass ; chlor ine and steam are produced and disengaged and there remain in the retort non-decomposed peroxide of manganese and chloride of manganese and chlaride of calcium. The chlor ine is collected in the water or led away into a chamber for tha production of dry hypochlorites. Over the mixture re maining in the retort a current of air or oxygen of the same temptrat are is caused to pass which in the presence of per oxide of manganese decomposes at once the chloride of man ganese alone or the chlorides of manganese and calcium re generated from the sesquioxide of manganese alone into see quioxide of manganese mixed with lime and sets at liberty the chlorine contained in the chlorides. This chlorine mixed with air and azote or oxygen is led into vats cootaining a mixture of lime and protoxide of manganese which has been previously produced by the decomposition of chloride of cium produced in this reaction having been previously run off. In presence of the oxygen of the air and of the chlorine it produc
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