off the water supply. In this engine the crank is dispensed with and the valve gear so arranged as to prevent stoppage on the dead centers. Danger of Galvanized Cooking Utensils Water Pipes Etc. To the Editor of the Scientific American: toys etc. and from the remarks preceding judge that you agree with what follows. I have always in the practice of my profession (analytical chemistry) strongly deprecated the use of galvanized articles water pipes culinary utensils tanks etc. ; but am well aware that this is a point on which the doctors disagree. I would like exceedingly to have the matter argued in your excellent paper by disinterested par ties for I have somewhat myself to say on the subject. cates from practical chemists to the effect that galvanized pipe is harmless and the best for general use and that citizens are advised to employ it. I consider the use of zinc-coated pipes or vessels for culinary purposes both filthy and dan gerous to the public health whether they are used cautiously and intelligently or rashly like the farmer who purposed to boil down cider and sour apples in a galvanized tank. In large houses where there are great lengths of galvanized piping much zinc goes into the systems of the inmates pro ducing more or less ill health and discomfort ; I have heard complaints of milky drinking water on the breakfast table etc. proving that the servants draw water for use directly That zinc-lined pipes contaminate water flowing through them for very long periods is plain from the following: The water for my hothouses flows through 190 feet of inch gal vanized pipe from the street main; the water is from Wen ham Lake and proverbially pure; the pipe has been in posi tion and daily use for seven years; even now the first water drawn from this pipe in the morning is quite opalescent from hydrated oxide of zinc. I would be loth to drink such water ; and believing that what is unfit for animals' use from metallic contamination cannot benefit plants I have giv
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