In all cases where a husband and wife shall sell land held as a tenancy by the entirety and accept in part payment for the purchase price the note or other obligation of said purchaser payable to said husband and wife, secured by a mortgage on said land payable to husband and wife, the said debt together with all interest thereon, unless otherwise expressly stated in said mortgage, after the death of either shall be payable to the survivor, and the title to said mortgage shall vest in the survivor, and in case a contract for the sale of property owned by the husband and wife as tenants by the entirety, is entered into by them as vendors, the same provisions herein applying to the rights of the survivor in mortgages as above set forth, shall apply to the survivor of the contract.