Opinion by

William Anderson brought this action against the Carnegie Steel Company to recover damages for injuries sustained while serving it as one of its employees on January 12,1916. The affidavit of defense averred that the case was within the scope of the Workmen’s Compensation Act of June 2, 1915, P. L. 736; that said act is constitutional and that what is therein provided is plaintiff’s exclusive remedy. This raised a question of law and the court below disposed of it by entering judgment for the defendant in accordance with the provisions of Section 20 of the Procedure Act of May 14,1915, P. L. 483.

Nothing appears in plaintiff’s statement of his claim to take his case out of the Workmen’s Compensation Act, and its constitutionality is the sole question involved in this appeal. We take up the objections to its constitutionality in the order in which counsel for appellant has presented them.

It is first contended that Section 201, Article II, of the Act of 1915, is unconstitutional, because (1) it is violative of Article I, Section 9, of our Constitution, which provides that one cannot be deprived of his property “un*37less by the judgment of Ms peers or the law of the land,” and (2) because it is in contravention of the Fourteenth Amendment to the Constitution of the United States, which declares that no one shall be deprived of his property “without due process of law.”. Section 201 is as follows: “In any action brought to recover damages for personal injury to an employee in the course of his employment, or for death resulting from such injury, it shall not be a defense — (a) That the injury was caused in whole or in part by the negligence of a fellow employee; or (b) That the employee had assumed the risk of thé injury; or (c) That the injury was caused in any degree by the negligence of such employee, unless it be established that the injury was caused by such employee’s intoxication or by his reckless indifference to danger. The burden of proving such intoxication or reckless indifference to danger shall be upon the defendant, and the question shall be one of fact to be determined by the jury.” It is urged that the taking away of these defenses is deprivation of property without due process of law. Section 201 applies only to actions at law for damages resulting from the negligence of employers, and by it they may no longer set up certain defenses available under the common law; but no one has property in any rule of that law. Rights of property may be acquired under it, and, when so acquired, the owner of them is not to be deprived of them “unless by the judgment of his peers or the law of the land”; but, while rights of property created by the unwritten law cannot be taken away without due process of law, the common law itself may be changed by statute, and, from the time it is so changed, it operates in the future only as changed. The written and unwritten law are both rules of civil conduct proceeding from the supreme power of the State. “That one is unwritten and the other written can make no difference in their validity or effect. The common law did not become a part of the’ laws of the states of its own vigor. It has been adopted by constitutional provision, *38by statute or decision, and, we may say in passing, is not the same in all particulars in all the states. But however adopted, it expresses the policy of the State for the time being only and is subject to change by the power that adopted it”: Western Union Telegraph Company v. Commercial Milling Company, 218 U. S. 406. In Mondou v. N. Y., N. H. & H. R. R. Co., 223 U. S. 1, it was held that an act of congress abolishing the defenses of assumption of risk and the fellow servant rule, and providing that contributory negligence shall merely mitigate damages, did not violate the “due process'of law” clause of the Constitution, and, in so holding, it was said: “A person has no property, no vestéd interest, in any rule of the common law. That is only one of the forms of municipal law, and is no more sacred than any other. Rights of property which have been created by the common law can not be taken away without due process; but the law itself, as a rule of conduct, may be changed at the will......of the legislature, unless prevented by constitutional limitations. Indeed the great office of statutes is to remedy defects in the common law as they are developed, and to adapt it to the changes of time and circumstances.” Other cases to the same effect are: Young v. Duncan, 218 Mass. 346; Borgnis v. Falk Co., 147 Wis. 327; Sexton v. Newark Dist. Tel. Co., 84 N. J. L. 85; State v. Creamer, 85 Ohio St. 349. The first contention of the appellant is groundless.

It is next contended that Section 204, of Article II, of the Act of 1915, is unconstitutional, because it is an unreasonable interference with the right of an individual to make his own contract. That section is as follows: “No agreement, composition, or release of damages made before the happening of any accident, except the agreement defined in Article III of this act, shall be valid or shall bar a claim for damages for the injury resulting therefrom; and any such agreement, other than that defined in Article III herein, is declared to be against the public policy of this Commonwealth. The receipt of *39benefits from any association, society, or fund shall not bar the recovery of damages by action at law, nor the recovery of compensation under Article III hereof; and any release executed in consideration of such benefits shall be void.” At the time the Act of 1915 was passed the settled law of this State was that a contract limiting or releasing damages for future negligence was against public policy: Penna. R. R. v. Butler, 57 Pa. 385; Grogan & Merz v. Adams Express Co., 114 Pa. 523; Penna. R. R. v. Raiordon, 119 Pa. 577. The foregoing section is but a statutory extension of the same principle.

It is further urged that Sections 301, 302 and 303, of Article III, of the Act of 1915, are unconstitutional, because they are violative of Article I, Section 6, of our Constitution, “which declares that “trial by jury shall be as heretofore, and the right thereof remain inviolate.” If the foregoing sections are to be binding on an employer or employee in any case, they will be so only after both have agreed they shall be so bound. It is clearly pointed out in Section 302 to each of the contracting' parties how either of them may, in a very simple way, prevent the operation of Article III. Neither of them is deprived of a trial by jury except by his own consent, conclusively presumed to have been given, unless withheld in the manner prescribed by the act.- Either party, employer or employee, by his statement in writing to the other that the provisions of Article III of the act “are not intended to apply,” may prevent their application. Nothing is to be found in the said three sections depriving employer or employee of the constitutional right of a trial by jury. They merely permit a waiver of the same, if both so agree, and neither the Federal nor State Constitution precludes such waiver: Krugh v. Lycoming Fire Insurance Company, 77 Pa. 15.

Finally, it is contended that Article/ III, of the Act of 1915, is unconstitutional, because it is violative of Section 21, of Article III, of our Constitution, which provides: “No act of the general assembly shall limit the' *40amount to be recovered for injuries resulting in death, or for injuries to persons or property; and in case of death from such injuries, the right of action shall survive, and the general assembly shall prescribe for whose benefit such actions shall be prosecuted.” It need only be said of this contention that the amount to be recovered for injuries to an employee is limited only when the parties to the contract of employment so agree.

The assignment of error is overruled and the judgment is affirmed.