John Henry Gurney Jr., On the Misdeeds of the House-Sparrow (1887)
“ No one has ever answered the late Colonel Russell's query:—"Why is it that in fields far away from farm-premises, where there are no Sparrows, insects do not increase and multiply?" And why have not insects multiplied at Colonel Russell's place in Essex, where, for many years, Sparrows were rigorously kept down, in fact almost exterminated? The reason must be that the caterpillars are eaten by other small birds, such as Chaffinches, Greenfinches, and Yellow-Hammers, and by a host of Warblers and other birds which visit this country for the summer, when insect-life in all its stages is rampant. ”
