Last year Drs. Moore and Kellerman1 of the Bureau of Plant Industry, U. S. Department of Agriculture, made the important discovery that copper and its salts in very high dilutions are very efficient in killing green algæ and also various kinds of bacteria. Since that time a large amount of work has been done, especially in relation to water supplies, in order to test the accuracy of their claims and in practically every instance their results have been substantiated. Last summer in New York City, the ponds in the parks were treated with copper sulphate by rowing a boat from which bags of the salt were suspended in the water. The small amount of copper thus passing into solution was found very efficient in removing the foul smelling green scum which collects in the ponds, without interefering in any way with the growth of the higher desirable plants.
ACTION OF COPPER AND ITS SALTS ON ORGANISMS. JAMA. 1905;XLV(5):330. doi:10.1001/jama.1905.02510050034004
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