Provided also, that where any specifick thing incapable of division or apportionment shall have been reserved or made payable to the lessor or lessors, his or their heirs or successors, either by way of rent or by any covenant or agreement contained in any such entire lease, the same may be wholly reserved and made payable out of a competent part of such lands or tenements demised by any such several lease as aforesaid; and in case in any lease already granted and intended hereby to be confirmed any such provision shall appear to have been made or the payment and delivery of any such sum or sums of money, stipends, augmentations or other things as aforesaid, the same shall be deemed and taken to have been lawfully made, in case the lands and tenements charged therewith shall be of a greater annual value than the payment or other things so charged, exclusive of the rent or other annual payment reserved to the lessor or lessors.