Section 19. In a conveyance of real estate the words ''mortgage covenants'' shall have the full force, meaning and effect of the following words, and shall be applied and construed accordingly: ''The mortgagor, for himself, his heirs, executors, administrators and successors, covenants with the mortgagee and his heirs, successors and assigns, that he is lawfully seized in fee simple of the granted premises; that they are free from all encumbrances; that the mortgagor has good right to sell and convey the same; and that he will, and his heirs, executors, administrators and successors shall, warrant and defend the same to the mortgagee and his heirs, successors and assigns forever against the lawful claims and demands of all persons; and that the mortgagor and his heirs, successors or assigns, in case a sale shall be made under the power of sale, will, upon request, execute, acknowledge and deliver to the purchaser or purchasers a deed or deeds of release confirming such sale; and that the mortgagee and his heirs, executors, administrators, successors and assigns are appointed and constituted the attorney or attorneys irrevocable of the said mortgagor to execute and deliver to the said purchaser a full transfer of all policies of insurance on the buildings upon the land covered by the mortgage at the time of such sale''.