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The electro ultrafilter of Bechhold,1 which, as is known, gives a rapid dialysis, at the same time concentrating the solution, is for that reason of the greatest utility in the laboratory for chemical and physical chemistry purposes, but it has for us the inconvenience of being made with an apparatus of porcelain Bechhold-Konig only manufactured in Germany. This makes it necessary to buy spare parts or in the case of breakages to interrupt the work for some time. The first alternative is

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