187. Several mortgagors.

Where there are several mortgagors the mortgage may, depending on its construction, either secure only joint liabilities or secure the several liabilities of any of the mortgagors; and where the 'mortgagor' is defined as referring to all and/or any one of those persons and their obligation is expressed to be joint and several, all mortgagors are jointly and severally liable for the several liabilities of each of them