Interest and dividend certificates ; also those parts of a commercial instrument which are to be cut, and which are evidence of something connected with the contract mentioned in the instrument. They are generally attached to certificates of loan, where the interest is payable at particular periods, and, when the interest is paid, they are cut off and delivered to the payer. Wharton. Coupons are written contracts for the payment of a definite sum of money on a given day, and being drawn and executed in a form and mode for the purpose, that they may be separated from the bonds and other instruments to which they are usually attached, it is held that they are negotiable and that a suit may be maintained on them without the necessity of producing the bonds. Each matured coupon upon a negotiable bond is a separable promise, distinct from the promises to pay the bonds or the other coupons, and gives rise to a separate cause of action. Aurora v. West, 7 Wall. S8, 19 L. Ed. 42.