delivered the opinion of the court.
Edward H. ,Frevert was employed by the defendant to perform work and labor as a tailor, cleaner, dyer and presser at the stipulated wage of $40 per week and other considerations not here involved. He received the $40 per week each week during the period of his employment, and at its conclusion brought this action to recover for overtime work. It was the contention of plaintiff at the trial—supported by his own testimony—that his compensation under the original contract of employment was based upon a week of six days of eight hours each; that at the special instance and request of the defendant he worked overtime upon the express agreement that he should receive extra compensation therefor. The defendant denied that there was any contract for overtime work, and denied .specifically that plaintiff performed any service other than that contemplated by the original agreement. The trial of the cause resulted in a verdict for plaintiff, and from the judgment entered thereon and from an order denying a new trial defendant appealed. After judgment was entered, plaintiff died, and the administrator of his estate was substituted as a party.
The complaint was not attacked in the lower court, and the objection now made that it does not state facts sufficient to constitute a cause of action is without merit.
Plaintiff did not set forth directly the terms of the original contract, but he did allege that “at the special in*170stance and request of the defendant [he] performed extra work and worked overtime for said defendant over and above the regular hours of work which were eight hours per day,” eta. <
The allegations of the complaint are to be construed liberally with a view to substantial justice between the parties (sec. 9164, Rev. Codes 1921; Gauss v. Trump, 48 Mont. 92, 135 Pac. 910), and whatever is necessarily implied in or is reasonably to be inferred from them is to be taken as averred directly. (Buhler v. Loftus, 53 Mont. 546, 165 Pac. 601.) Although the pleading may be open to the criticism that it is ambiguous or uncertain, the objection to it upon that score was waived by failure to demur specially. (See. 9136, Rev. Codes 1921.)
It is argued that the evidence is insufficient to establish the reasonable value of the extra services for which compensation is sought, but the argument should have been addressed to the jury. Plaintiff testified to the reasonable value of such services, and it cannot be questioned that the evidence was competent. The weight to be given to it was for the jury to determine. In Matoole v. Sullivan, 55 Mont. 363, 177 Pac. 254, this court quoted with approval from Wigmore on Evidence, as follows: “It would be, a hard rule which would prevent a plaintiff from informing the jury of his own estimate of the value of his services; and the courts seem inclined to impose no terms as to his general familiaiity with the class of services; that he had rendered them justifies listening to his opinion.” (1 Wigmore on Evidence, see. 715.)
The rules of law which- govern a case of this character are well settled. Whenever the extra work performed is of a character different from that contemplated by the original contract of employment, its performance by the employee and acceptance by the employer will raise an implication that extra compensation was intended therefor. (Sowash v. Emerson, 32 Cal. App. 13, 161 Pac. 1018.) On the contrary, all services *171rendered by the employee during his employment which are similar in character to his regular duties are presumed to be compensated for by the stipulated wage or salary, and to overcome this presumption the employee must discharge the burden of proving the existence of an express contract by the terms of which extra compensation was to be made for the extra services rendered. (Jerome v. Wood, 39 Colo. 197, 12 Ann. Cas. 662, and note, 88 Pac. 1067; United States v. Martin, 94 U. S. 400, 24 L. Ed. 128; 18 R. C. L. 534.)
If the testimony of Frevert be accepted as true, the terms of the original agreement, including a provision that eight hours of labor should constitute a day’s work, and the existence of an express, supplemental contract by the terms of which he was to receive extra compensation for overtime, are established, and the general verdict determines the truth of his testimony for all purposes of these appeals. The fact that his testimony was not corroborated does not militate against the validity of the verdict. A preponderance of the evidence may be established by the testimony of a single witness against a greater number of witnesses who testify to the contrary (Story v. Maclay, 6 Mont. 492, 13 Pac. 198; Parchen v. Chessman, 53 Mont. 430, 164 Pac. 531), for the jurors are the exclusive judges of the credibility of the witnesses (sec. 10672, Rev. Codes 1921), and the direct evidence of one witness who is entitled to full credit is sufficient proof of any fact except perjury or treason (sec. 10505, Rev. Codes 1921).
The acceptance of plaintiff’s version of the transaction as against the testimony given by the defendant and his witnesses was one of the hazards of the trial which defendant must accept. So long as we have the jury system, the jury’s findings upon disputed questions of fact must be conclusive except as against a motion for a new trial, and this court cannot be asked to substitute its judgment for the judgment of the men chosen to determine such questions. The utmost for which defendant can contend is that the evidence is in direct *172conflict, and under the well-established rule a verdict in an action at law, attacked on the ground of insufficiency of the evidence to sustain it, will not be set aside on appeal, where the evidence is substantial, though conflicting, and the lower court has set the stamp of its approval on the findings by denying a motion for a new trial, in the absence of any showing of an abuse of discretion (Lizott v. Big Blackfoot M. Co., 48 Mont. 171, 136 Pac. 46; Western Mining Supply Co. v. Melzner, 48 Mont. 174, 136 Pac. 44), and this is true even though the printed record may appear to indicate that the evidence preponderates against the verdict. (Roberts v. Sinnott, 55 Mont. 369, 177 Pac. 252.)
The judgment and order are affirmed.
Affirmed.
Mr. Chief Justice Brantly and Associate Justices Cooper and Galen concur.