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 interfering in any way with
the growth of the higher desirable plants.
ACTION OF COPPER AND ITS SALTS ON ORGANISMS.. JAMA. 2005;294(3):380. doi:10.1001/jama.294.3.380-a
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