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At bottom left , asphalt grafting compound is applied to a completed whip graft to prevent wood tissues from drying out . This module consists of weekly oral workshops , together with fortnightly language classes which are devoted primarily to unseen translation but also include practice in free composition and grammar revision as appropriate . Since earthquakes do not recur with sufficient frequency to acquire the necessary data in a single location , we must resort to what might be termed an " ergodic " hypothesis and study earthquakes worldwide , with the idea of recognizing patterns associated with broad sets of geological and tectonic circumstances , which presumably apply to other similar areas . Standard rootstocks are more tolerant to wetter and drier soils and are better anchored than are the dwarfing types . The disease causes flower buds to droop and remain closed .