The law in force when a contract is made is a part of such contract as fully as if its provisions had been incorporated into such contract.1 Thus a contract between heirs with reference to property descending to them is governed by the law of descent as then interpreted by the court, and a subsequent change of judicial decision will not change the legal effect of such contract.2 An unconstitutional statute does not become a part of a contract made after such statute is passed and before it is declared unconstitutional, where the contract does not expressly incorporate the provisions of such statute.3 Even if the provisions of the unconstitutional statute are carried into the contract in compliance with the peremptory requirements of such statute, they do not thereby in legal effect become a part of such contract.4 "It is not in the power of the legislature to

24 Heine Safety-Boiler Co. v. Francis Brothers, 105 Fed. 413.

25 Nye v. Lovitt, 92 Va. 710; 24 S. E. 345.

26 Clark v. Neumann, 56 Neb. 374; 76 N. W. 892.

1 Bank v. Eaton, 95 Fed. 355; Ede v. Knight, 93 Cal. 159; 28 Pac. 860; Kendall v. Fader, 199 111. 294; 65 N. E. 318; affirming, 99 111. App. 104; Andrews, etc., Co. v. Atwood, 167 111. 249; 47 N. E. 387; affirm-ing, 67 111. App. 303; Barrett v. Boddie, 158 111. 479; 49 Am. St. Rep. 172; 42 N. E. 143; 43 N. E.

367; Haskett v. Maxey, 134 Ind. 182; 19 L. R. A. 379; 33 N. E. 358; Graves County Water Co. v. Ligon, 112 Ky. 775; 66 S. W. 725; Phinney v. Phinney, 81 Me. 450; 10 Am. St. Rep. 266; 4 L. R. A. 348; 17 Atl. 405; Manistee Iron Works Co. v. Lumber Co., 92 Wis. 21; 65 N. W. 863.

2 Haskett v. Maxey, 134 Ind. 182; 19 L. R. A. 379; 33 N. E. 358.

3 Palmer v. Tingle, 55 O. S. 423; 45 N. E. 313.

4 People v. Coler, 166 N. Y. 1: 82 Am. St. Rep. 605; 59 N. E. 716; protect an invalid law from judicial scrutiny by providing that it must receive the assent of the parties to every contract to which it relates."5