Plaintiff bears the burden of proving that he performed his obligation by affecting a purchase, procuring a responsible purchaser or making an enforceable contract of asle in accordance with his instructions. Hammond v. Mitchell, 61 I11. App. 144; Leahy v. Hair, 33 I11. App. 461; Davis v. Gassette, 30 I11. App. 41; Pratt v. Hotchkiss, 10 I11. App. 603; Peet v. Sherwood, 47 Minn. 347, 50 N. W. 241, 929; Young v. Ruhwedel, 119 Mo. App. 231, 96 S. W. 228; Kirvin v. Barney, 57 N. Y. S. 812, 27 Misc. 181; Kirvin v. Barney, 61 N Y. S. 122, 29 Misc. 614; Cooper v. Lawrence, 110 N. Y. S. 238; Geiger v. Reiser (Colo. Sup. '10), 107 P. 267; Kalkstein v. Jackson, 116 N. Y. S. 302; Abbott v. Lee, 85 A. 526, 86 Conn. 392; West v. Hudson, 137 N. W. 272, 173 Mich. 553; Henry v. Harker, 118 P. 205, 61 Or. 276, judg. aff. on re., 122 P. 298, 61 Or. 276; Baldino v. Henneberry, 191 I11. App. 368; J. A. Dean & Son v. Goodrich, 140 N. W. 435, 160 Iowa, 98; Duncan v. Turner, 154 S. W. 816, 171 Mo. App. 661; Jennings v. Overholt, 172 S. W. 449, 186 Mo. App. 505; Newman v. Dunleavy, 149 P. 970, 51 Mont. 149; Johnson v. Payne Inv. Co., 141 N W. 1022, 93 Neb. 652; Jenkins v. Ma-honey, 127 N. Y. Sup. 573, 142 App. Div. 653; McCorry v. John C. Wiarda & Co., 134 N. Y. Sup. 667, 149 App. Div. 863; Cook v. Gordon, 137 P. 782, 68 Or. 557; Hoffman v. Steele, 139 N. W. 733, 152 Wis. 84; Dyar v. Stone, 137 P. 269, 23 Cal. App. 143; Lowenstein v. McPeak, 48 Pa. Super. Ct. 280; Swee v. Neumann, 123 N. Y. Sup. 776, 67 Misc. Rep. 605; Schmidt v. Dunne, 163 N. Y. Sup. 515; Woolf v. Hamburger, 201 I11. App. 612; Young v. Dempsey, 67 Pa. Super. Ct. 534; Brittain v. Rice, 204 S. W. 254, - Tex. Civ. App. -; Sanden & Huse v. Ausenhus, 168 N. W. 801, - Iowa Sup. -; Thomas v. Wychoff, 174 N. W. 26, - Iowa Sup. - .