to firms in partnership, and the repayment of advances, 435-Effect of changes in the firm, 436—
438-Continuing liabilities on bonds, 439-Continuing guarantees, 440, 441-Avoidance of the
contract by reason of fraud or concealment between the creditor and the principal, 442--Discharge
of the surety by the extinguishment of the primary obligation, or by giving time to the principal,
443-445.