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Show ONE EVIL REPLACING ANOTHER. Dr. John Le Conte read at tbe Hartford meeting of the American Association an interesting account of the replacement ot one kind of cat-epillar, cat-epillar, which had been a great nuisance nui-sance in that city, by another, which was now becoming equally troublesome. trouble-some. The first variety was exterminated exter-minated by the introduction of tbe English sparrows; and the trees were thus enabled to put iorth their leaves in abundance. But this favored the erowth of a new species of larva, which, being covered witb stiff hair, is not attracted by the sparrows, and which has already become ko uumer-ous uumer-ous as to be nearly as troublesome as its predecessor. Fortunately its habits hab-its are such that it can easily be reached and destroyed in the chrysalis chrysa-lis stage of its existence. The story is an interesting illustration of several r,,.;- : t, theories of Darwin and Wallace. (Xu-inH-Union. |