485; American, etc., Ass’n v. Harn (Tex. Civ. App) 62 8S. W. 75; Beals v. Amador County, Cal. 6383. imple interest is that which is paid for the principal or sum lent, at a certain rate or allowance, made by law or agreement of parties—OComypound interest is interest upon interest, where accrued interest is added to the principal sum, and the whole treated as a new principal, for the calculation of the interest for the next period. —Ex-interest. In the language of stock exchanges, a bond or other interest-bearing security is said to be sold “ex-interest’” when the vendor reserves to himself the interest already accrued and payable (if any) or the interest accruing up to the next interest day.—Interest, maritime. See MABITIME INTEBEST.—Inteore est upon interest. Compound interest.