It will be remembered that at the meeting of the Club a year ago, Professor J. B. Smith gave the results of his observations for that year upon the Elm-leaf Beetle at New Brunswick, N. J., and concluded that it was single-brooded there. His observations were so carefully made that his conclusions could not well be doubted; yet they did not agree with those made at Washington, where the species had been found to be at those made at Washington, where the species had been found to be at least double-brooded. In the article which I had published upon this insect in Bulletin 6 of the Division of Entomology of the Department of Agriculture, I had discussed the evidence as to number of broods, both from European sources and my own experience; but Professor Smith's observations were so conclusive, so far as his locality is concerned, that I felt the need of more accurate notes than any that had been published hitherto, and of teh desriability of setting the question as to number of broods at Washington by a series of carefully-planned indoor experiments, where, by breeding from one generation to another, there could be no question of an erroneous conclusion.