"It appears to me that these principles of Equity are not less applicable to cases of the third class, - cases in which there is, strictly speaking, no contract of suretyship, but in which there is a primary and secondary liability of two persons for one and the same debt, by virtue of which, if it is paid by the person who is not primarily liable, he has a right to reimbursement or indemnity from the other, - than to those of the second class, in which there is a contract of suretyship to which the creditor is not a party. To this third class of cases, the rights of an indorser against an acceptor of a bill of exchange may most properly be referred. The liability of the indorser to the holder is, by the law merchant, conditional, and (as was said by Mr. Justice Buller, in Tindal v. Brown (1786) 1 TR 167 at p 170 (99 ER 1033 at p 1035); aff [1788] EngR 54; (1787) 2 TR 186 (100 ER 101) 'only secondary'; but, when the conditions required by that law are fulfilled, it becomes absolute, and is that of a principal; and the indorser's right, if he pays the holder, to recover over against the acceptor is not founded on any agreement between him and the acceptor (who is as likely as not to be a stranger without any communication with him before the indorsement), but is established by the same law." (at p669)