257. Effect on sub-mortgage of the exercise of power of sale.

If the assistance of the court is necessary for a sale, and the original mortgage is to secure an unascertained amount, an account must first be taken of what is due on it1. Where a bankrupt mortgagee has purchased the equity of redemption2, a sub-mortgagee by deposit is entitled to a sale of the bankrupt's entire interest3. There may also be a power of sale incident to the sub-mortgage