At which time, in wills, standing by itself unqualified and unexplained, this is a word of condition denoting the time at which the gift is to continence. 2. The context of a will may show that the word when is to be applied to the possession only, not to the vesting of a legacy; but to justify this construction, there must be circumstances, or other expressions in the will, showing such to have been the testator’s intent.