189. Payment of interest.

The covenant fixing the date of payment generally provides for interest in the meantime1. This is not, however, necessary in the case of simple interest2, for a mortgage, whether legal or equitable, carries interest even if interest is not expressly reserved3 and even if it secures the debt of a third party who is not liable to pay interest to the creditor4. A power to charge an estate with a specific sum of money without mentioning interest includes a power to charge with interest5, and the right to interest is implied where a principal sum is charged on property