Under this title, Dr. J. C. Arthur gives in the Report of the Botanist to the New York experimental station, a list of all the leading references to pear blight he has been able to find. The first note is by William Denning, 1794. Coxe comes next in 1817. It is often difficult to make out from these essays whether the authors had what we call fire blight in mind or not. Coxe appears to have in his mind what we know as fire blight, so that we may feel pretty certain the disease was very bad before his time. "In twenty years" he had lost by the sudden taking off, "upwards of twenty trees." What we know as " frozen sap blight" - the blackening of leaves, and blackening the bark of one year's old wood, soon after growth commences in spring, though having evidently no relation to frost, but probably to some form of fungus attack, is confounded by most of the old writers and many of the modern, with fire blight, which is a summer disease.