Husband, in order to provide for the support and maintenance of wife if he predeceases her, charges his estate, consisting of all of his property, real and personal and mixed, and his heirs, executors, administrators and assigns, with the payment to her of $_____ per annum payable in equal monthly instalments in advance on the first day of each and every month so long as she lives, provided however, that, in event wife should remarry, such payments shall be reduced to the sum of $_____ per month, payable in advance on the first day of each and every month, and this charge shall be a first and prior charge and lien over all of his bequests, legacies in any last will and testament and over all gifts and transfers he may make prior to death, designated or having the effect of defeating this charge. But husband reserves the right to provide for such support and maintenance of wife after his decease by establishing an adequate trust fund in her behalf either while living or by the provisions of his last will and testament, which shall yield an income to her of at least $_____ per annum (and/or $_____ per annum in case of her remarriage) and such provisions having been made and communicated to wife, the remainder of his estate shall be free from the lien of the charge provided.