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"Having, for fifteen years," says the latter author, "incessantly studied the habits of lignivorous insects in one of the best wooded regions of France, I have observed facts enough to feel myself warranted in expressing my conclusions, which are: that insects in general—I am not speaking of those which confine their voracity to the leaf—do not attack trees in sound health, and they assail those only whose normal conditions and functions have been by some cause impaired."

Lignivorous: feeding upon wood or woody tissues.

"Having, for fifteen years," says the latter author, "incessantly studied the habits of lignivorous insects in one of the best wooded regions of France, I have observed facts enough to feel myself warranted in expressing my conclusions, which are: that insects in general—I am trees in sound health, and they assail those only whose normal conditions and functions have been by some cause impaired."

The felled timber attracts lignivorous insects, and these draw in their train the predaceous species of various families.