other production payment was behind schedule, that some of the wells underlying Hopkins’ payment were not producing or were underproducing, and that an involuntary petition for bankruptcy had been filed against Trice.
To be sure, Hopkins and its advisers did not stand idly by as this bad news rolled in. They conducted investigations that led them to believe that Trice’s troubles, and Hopkins’ own worries, were caused by factors other than deficiencies in the estimates of the future net revenue. But the one-year limitation of Section 13 does not depend wholly on the subjective judgment of the buyer. Instead it must be tested by the objective standard of reasonable diligence on the part of the buyer in making discovery. Rosenberg v. Hano, 121 F.2d 818, 821 (3d Cir. 1941); cf. Goldenberg v. Bache & Co., 270 F.2d 675, 681 (5th Cir. 1959).
Perhaps, as Hopkins argues, Trice’s shaky financial condition would not alert an investor to fraud. But surely the failure of some wells to produce as scheduled coupled with Trice’s lack of candor about its finances might cause a reasonably diligent investor to probe the data upon which he based his purchase. Had Hopkins compared all the experts’ ■ reports, which it had a right to do under the terms of the production payment, it could readily have discovered the untrue statements and the omissions about which it now complains.
On summary judgment we must view the inferences pertaining to Hopkins’ diligence in the light most favorable to Hutton, the party opposing the motion. Since inferences contrary to those drawn by the district judge might be permissible, a genuine issue of fact was raised that should have been submitted to a jury. United States v. Diebold, 369 U.S. 654, 655, 82 S.Ct. 993, 8 L.Ed.2d 176 (1962). But Hopkins urges us to follow Dale v. Rosenfeld, 229 F.2d 855, 858 (2d Cir. 1956), which held that when a judge is the trier of fact the standard of due diligence is a question of law. And, continues Hopkins, since the issue of due diligence is a question of law, application of the statute of limitations was rightly decided by summary judgment. However, we need not in this case review the oft mooted question of whether a standard of care, such as reasonable diligence, presents a question of fact or of law or of both,6 for the rule stated in Dale is not applicable here. Hutton has demanded a jury, and the Dale court recognized, albeit by implication, that when a jury is the trier of fact, the issue should be submitted to it. See also Mamiye Bros. v. Barber Steamship Lines, Inc., 360 F.2d 774, 777 (2d Cir.), cert. denied 385 U.S. 835, 87 S.Ct. 80, 17 L.Ed.2d 70 (1966) (dictum). It is sufficient for us to say that when, as here, a jury has been demanded .and the facts give rise to conflicting inferences on the issue of reasonable diligence, the question must be submitted to the jury. Azalea Meats, Inc. v. Muscat, 386 F.2d 5, 9 (5th Cir. 1967); cf. Schillner v. H. Vaughan Clarke & Co., 134 F.2d 875, 878 (2d Cir. 1943).7
IV.
Finally, on two remaining issues, we conclude, for reasons adequately stated by the district court, that rescission is a proper remedy8 and that Hutton’s motion to file a third party
6
Compare Mamiye Bros. v. Barber Steamship Lines, Inc., 360 F.2d 774, 776 (2d Cir.), cert. denied 385 U.S. 835, 87 S.Ct. 80, 17 L.Ed.2d 70 (1966), with Pacific Tow Boat Co. v. States Marine Corp., 276 F.2d 745, 752 (9th Cir. 1960). See Nuckoles v. F. W. Woolworth Co., 372 F.2d 286, 288 (4th Cir. 1967).
7
Hopkins also claims that Hutton is es-topped to plead the statute of limitations because Hutton withheld unfavorable information that came to its attention after the sale. The district judge did not rule on this issue, and in the absence of the necessary factual background, we express no opinion about it.
8
Johns Hopkins University v. Hutton, 297 F.Supp. 1165, 1224 (D.Md.1968) (Kaufman, J.).