acceleration, doctrine of

Where interests in property have been conferred in property have been conferred by a testator in succession, e.g., to X for life, remainder to Y and the gift to X is determined before the time envisaged by the testator, Ys interest is accelerated. If it is discovered that, e.g., X cannot take under the will (because he witnessed it), Ys interest becomes immediate. The doctrine does not apply to a contingent gift: