118 PUBLIC LAWS-CH. 168 -APR. 2, 1948 [62 STAT. an interest which will terminate or fail upon the death of such spouse if- "(i) such death will cause a termination or failure of such interest only if it occurs within a period not exceeding six months after the decedent's death, or only if it occurs as a result of a common disaster resulting in the death of the decedent and the surviving spouse, or only if it occurs in the case of either such event; and "(ii) such termination or failure does not in fact occur. "(E) Valuation Of Interest Passing To Surviving Spouse.- In determining for the purposes of subparagraph (A) the value of any interest in property passing to the surviving spouse for which a deduction is allowed by this subsection- "(i) there shall be taken into account the effect which a tax imposed by this chapter, or any estate, succession, legacy, or inheritance tax, has upon the net value to the surviving spouse of such interest; and "(ii) where such interest or property is incumbered in any manner, or where the surviving spouse incurs any obligation imposed by the decedent with respect to the passing of such interest, such incumbrance or obligation shall be taken into account in the same manner as if the amount of a gift to such spouse of such interest were being determined. "(F) Trust With Power Of Appointment In Surviving Spouse.- In the case of an interest in property passing from the decedent in trust, if under the terms of the trust his surviving spouse is entitled for life to all the income from the corpus of the trust, payable annually or at more frequent intervals, with power in the surviving spouse to appoint the entire corpus free of the trust (exercisable in favor of such surviving spouse, or of the estate of such surviving spouse, or in favor of either, whether or not in each case the power is exercisable in favor of others), and with no power in any other person to appoint any part of the corpus to any person other than the surviving spouse- "(i) the interest so passing shall, for the purposes of subparagraph (A), be considered as passing to the surviving spouse, and "(ii) no part of the interest so passing shall, for the purposes of subparagraph (B) (i), be considered as passing to any person other than the surviving spouse. This subparagraph shall be applicable only if, under the terms of the trust, such power in the surviving spouse to appoint the corpus, whether exercisable by will or during life, is exercisable by such spouse alone and in all events. "(G) Life Insurance With Power of Appointment in Sur- viving Spouse. -In the case of proceeds of insurance upon the life of the decedent receivable in annual or more frequent installments commencing within one year after the decedent's death, if under the terms of the policy all amounts payable during the life of the surviving spouse are payable only to such spouse, and if such spouse has the power to appoint all amounts payable after such spouse's death (exercisable in
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