Professor Eugene W. Hilyard says: - "Among the resistant stocks most readily available to California grape growers, the native wild grape, Vitis California, deserves earnest attention. In its botanical character it stands near the wild species from which the Clinton and Taylor are derived. And while it does not seem to harbor naturally either variety of the Phylloxera, experiments made by planting it among infested vines, seem to show that, although some insects will migrate and attach themselves to its roots, it does not suffer in any sensible degree from this attack. It should be understood that under similar circumstances the roots of the Clinton and Taylor are also visited by the insect, but without injuring vitality."