In the March number of the American Naturalist, Professor Riley shows that the phylloxera can be introduced by cuttings of vines, though not so probably as by rooted plants. In localities not infested by the insect, he would prohibit the importation of both cuttings and plants. In countries where the phylloxera already exists, it is of course another matter The great value of the American grape in Europe as a stock on which to graft the European sorts, is not that the Americans are free from phylloxera, but that they do not suffer so much from the attacks of the insect.