Express acquiescence in performance as tendered, thereby inducing the adversary party to believe that such performance is accepted as complete performance, amounts to a waiver.1 If the owner of a building in fact acquiesces in and approves of the work as done, such approval amounts to an acceptance,2 and waives objections such as failure to conform to the dimensions specified.3 Accordingly such parts of a building as have been completed, accepted and paid for by the owner before the entire building is completed, are thenceforth at the owner's risk in case of loss by fire.4 Under some statutes occupying a building is conclusive evidence of its completion. This is true only where the provisions of the statute requiring such contract to be filed have been fully complied with.5 An approval of proof of printing submitted for examination, and a direction to go ahead and print, is an acceptance of such proof, even though a material misprint was overlooked by both parties to the contract.6 Approval of a clay model of a monument prevents the vendee from subsequently avoiding liability because he is dissatisfied with the plaster cast made therefrom.7 In building contracts a disregard of certain covenants thereof by both parties while the contract is being performed is a waiver of such provisions and a breach thereof can not be subsequently invoked as a discharge of the contract.8 Provisions as to the method of determining extras,9 such as a provision requiring the written authority of the architect or engineer therefor,10 or forbidding subcontracting without the owner's written consent,11 are waived by acting without reference thereto. Terms and specifications in a building contract,12 or a provision requiring the certificate of the architect or engineer before payment,13 may be waived by the parties. If A has agreed to do certain work in a mine, and B has agreed to keep the mine free from water, A's conduct in notifying B that A can bail the water out is a waiver of B's duty under the contract to keep the mine free from water.14 A provision for forfeiture of a contract for printing, in case of assignment, is waived by acting under the contract with full knowledge of such assignment.15 A contract requiring written notice of defects in an article sold is waived by the vendor's acting upon a verbal notice.16 A provision in a contract to convey land to a corporation to be organized, that the capital stock shall be taken by bona fide and responsible parties, is waived where the promisor becomes a stockholder and acquiesces in the expenditures of money on behalf of the corporation without paying his subscription himself, and with presumptive knowledge of the financial responsibility of the remaining stockholders.17 A covenant not to use certain realty as a hotel,18 or a covenant to build to a certain line,19 may each be waived by acquiescing in a different use of such realty. A provision that a contract for extension of time on debts by taking the debtor's notes therefor shall not take effect unless all the creditors enter into such contract, is waived by accepting such notes when some creditors have not assented.20

5 Manthey v. Stock, 133 Wis. 107, 113 N. W. 443.

6 Fitzgerald v. La Porte, 64 Ark. 34, 40 S. W. 261.

7 Givinnup v. Shies, 161 Ind. 600, 69 N. E. 158.

8 Manitowoc Steam Boiler Works Co. v. Glue Co., 120 Wis. 1, 07 N. W. 515.

9 Patten & Davies Lumber Co. v. Amigo Co., - Cal -, 183 Pac. 439.

10 Patten & Davies Lumber Co. v. Amigo Co., - Cal -, 183 Pac. 439.

11 Creston Waterworks v. Creston, 101 la. 687, 70 N. W. 739.

1 Arkansas. Grand Lodge A. O. U. W. v. Davidson (Ark.), L. R. A. 1917C, 914, 191 S. W. 961.

Illinois. Hills v. McMunn, 232 III. 488, 83 N. . 963.

Michigan. Strome v. Lyon, 110 Mich. 680, 68 N. W. 983.

Oregon. Vnnderhoof v. Shell, 42 Or. 578, 72 Pac. 126.

Vermont. Shum v. Claghorn, 69 Vt. 45, 37 Atl. 236.

Virginia. Stonega Coke & Coal Co. v. Addington, 112 Va. 807, 37 L. R. A. (N.S.) 969, 73 S. E. 257.

2 Strome v. Lyon, 110 Mich. 680, 68 N. W. 983; Vanderhoof v. Shell, 42 Or. 578, 72 Pac. 126; Shum v. Claghorn, 69 Vt. 45, 37 Atl. 236.

3 Hutchins v. Webster, 165 Mass. 439, 43 N. E. 186.

4 McAlpine v. Female Academy, 101 Wis. 468, 78 N. W. 173.

5Willamette Steam Mills Lumbering & Mfg. Co. v. Los Angeles College Co., 04 Cal. 229, 29 Pac. 629.

6 Giles Lithograph & Liberty Printing Co. v. Chase, 149 Mass. 459, 14 Am. St. Rep. 439, 4 L. R. A. 480, 21 N. E. 765.

7 Thomas v. Gage, 156 N. Y. 612, 51 N. E. 307.

8 Swartzman v. Babcock, 218 Mass. 334, 105 N. E. 1022; Wood v. Boney (N. J. Eq.), 21 Atl. 574; Beswick v. Platt, 140 Pa. St. 28, 21 Atl. 306.

9 Meyer v. Berlandi, 53 Minn. 59, 54 N. W. 937.

10 Concord Apartment House Co. v. O'Brien, 228 111. 360, 81 N. E. 1038; Campbell v. Kimball, 87 Neb. 309, 127 N. W. 142; Bannon v. Jackson, 121 Tenn. 381, 130 Am. St. Rep. 788, 117 S. W. 504; McGrath Construction Co. v. Waupaca-Green Bay Ry., 148 Wis. 372, 134 N. W. 824.

11 Dan forth V. Tennessee & Coosa Ry., 93 Ala. 614, 11 So. 60.

12 Wood v. Boney (N. J. Eq.), 21 Atl 674; Beswick v. Platt, 140 Pa. St. 28, 21 Atl. 306.

13 O'Rourke v. Burke, 44 Neb. 821, 63 N. W. 17.

14 Stonega Coke & Coal Co. v. Ad-dington, 112 Va. 807, 37 L. R. A. (N. S.) 969, 73 S. E. 257.