Opinion by

This is an appeal from a summary judgment for want of a sufficient affidavit of defense. Plaintiff sued on a note signed by appellant and two other defendants. The affidavit does not deny its execution, but defendant, Yeager, avers an oral understanding whereby he was not to be liable unless Ahrens, a joint maker, was unable to repay plaintiff the sum of $15,000, loaned to the Delta Electric Power Company; in default of such payment, appellant was not to be liable until the Power Company had built a new dam then in contemplation and had made and floated a bond issue of $125,000, — from the proceeds of which issue the note was to be first paid. *169Until these things occurred, it was to he carried by the bank, and in no event was appellant to be called upon to pay more than one-fonrth of the amount of the note. Defendant claims there is provided a definite means for payment of the note within a reasonable time. This defense is untenable.

In an action on a promissory note, defense may be made of an oral contemporaneous parol agreement providing for payment of the note from a certain fund, or the raising of such fund for payment by means over which the promisor had control; in such case, the source of payment must be first exhausted before recourse can be had upon the note: Gandy v. Weckerly, 220 Pa. 285, 287; Keller v. Cohen, 217 Pa. 522, 526; and see Greenawalt v. Kohne, 85 Pa. 369, 375; Keough v. Leslie, 92 Pa. 424. 427; Cake v. Pottsville Bank, 116 Pa. 264, 270; Keller v. Cohen, 224 Pa. 434, 437; Alexander v. Righter, 240 Pa. 22, 26; Forcite Powder Co. v. Howley, 40 Pa. Superior Ct. 412, 415. Assuming that the averments were otherwise sufficient, the affidavit does not aver any such fund existed, or that any of the persons had control of the means whereby the funds might fee raised. It is admitted Ahrens was president of the Delta Company; this would not empower Mm to compel the execution of the agreement; and it does not otherwise appear how he could compel the corporation to build the dam or float the bonded indebtedness. As the learned judge of the court observes, before this defendant “could be liable, there must be a total liquidation of all the assets of tins third party, the Delta Electric Company, completely beyond the control of these parties.” Under the affidavit, defendant was not to be bound, under any circumstances, for payment of the note, as there is no limit to the time within which the things stated in the affidavit are to be performed, and no one to compel performance.

This is not a case of modification by parol. The agreement does more than vary the written instrument, it *170destroys it: Clarke v. Allen, 132 Pa. 40, 42; Irvin v. Irvin, 142 Pa. 271, 286; Ziegler v. McFarland, 147 Pa. 607, 610; Plunkett v. Roehm, 12 Pa. Superior Ct. 83, 86; Butler v. Keller, 19 Pa. Superior Ct. 472, 475. The statement that defendant was not to be liable in any event, except for one-fourth, is indefinite in substance and eannot be considered. The affidavit is not sufficient to bar the summary judgment.

The judgment of the court below is affirmed.