BUSHNELL, J.

Plaintiff Edwin Anderson, Jr., brought an action for damages against defendants Battista Conterio and Gogebic Auto Company, a Michigan corporation, because of injuries suffered in an accident sometime between the hours of 8 p.m., July 10, 1940, and 1 a.m., July 11, 1940, while he was an occupant of a motor vehicle being driven by defendant Conterio. Plaintiff claimed that at the time of the accident Conterio was in the performance of his duties as a salesman or agent of defendant Gogebic Company and was then demonstrating to plaintiff an automobile for the purpose of effecting a sale.

Conterio operated a garage at Marenisco, Michigan, where he lived. Defendant Gogebic Auto Company had its salesroom at Bessemer, Michigan. On the afternoon in question Anderson and his friend, Virgil LeBeouf, left Marenisco with Conterio in his automobile and traveled through Bessemer to Ironwood, where they visited the carnival at the county fair. They remained there for over an hour and then drove to Hurley, Wisconsin, where they spent about two hours, had some beer, and left Hurley about 12:30 a.m. for Marenisco. Anderson claimed that, while Conterio was attempting to pass another car on the highway between Ironwood and Bessemer, he operated his car in such a negligent manner that it crashed against a telephone pole and severely injured him.

Conterio claimed that Anderson and LeBeouf were guest passengers and that the trip was made solely for the purpose of attending the county fair. Anderson claimed the visit to the fair at Ironwood and the side trip to Hurley were incidental, but that the real purpose was to demonstrate the car so as to induce him to purchase one of like make from the Gogebic Company, who would in turn pay Conterio a commission on the sale.

Both defendants moved for a directed verdict at the close of plaintiff's case, which motions were denied, and these motions were renewed before the case was submitted to the jury. The court reserved decision on the motion for directed verdict in favor of the Gogebic Company and denied the motion for directed verdict in favor of Conterio. The jury returned a verdict in favor of Anderson in the sum of $5,000 against Conterio and found no cause of action as against Gogebic Company. Conterio sought a new trial, which was granted by the court, unless plaintiff consented to a remittitur of $1,500. Upon filing the remittitur, judgment was entered against Conterio in the sum of $3,500.

We are informed in plaintiff's brief that, since the appeal was entered, a suggestion of plaintiff's death has been filed and that his father has been appointed special administrator.

The questions raised on appeal by Conterio can be summarized as follows:

1. Did a host-guest relationship exist as a matter of law?

2. Did plaintiff produce sufficient evidence to support the jury's finding of negligence?

3. Did the trial judge err in refusing to declare a mistrial because of certain references to insurance?

4. Is the verdict inconsistent with plaintiff's pleadings and proofs?

If the purpose of the trip was that of "demonstrating" the car by Conterio either as agent for Gogebic Company or on his own behalf, plaintiff was not a "guest" within the meaning of the guest act. McGuire v. Armstrong, 268 Mich. 152, 157 (36 N.C.C.A. 252); Pietrantonio v. Tonn's Estate, 278 Mich. 535. See 1 Comp. Laws 1929, § 4648 (Stat. Ann. § 9.1446). The testimony on this point is in direct conflict, and that of plaintiff and his corroborating witness, LeBeouf, was impeached to some extent. However, it cannot be said as a matter of law that the testimony thus impeached was deprived of all probative value or that the jury could not believe it. The credibility of witnesses is for the jury, and it is not for us to determine who is to be believed. Linsell v. Linsell, 138 Mich. 64; and Reed v. McCready, 170 Mich. 532. The question of whether the trip was for the purpose of demonstrating the car or of visiting the fair was one of fact. The side trip to Hurley cannot affect the situation because the accident happened between Ironwood and Marenisco, just west of Bessemer.

The testimony regarding the accident is conflicting but there is sufficient evidence of defendant's negligence to support the verdict of the jury.

The matter of insurance was first brought into the case by counsel for Gogebic Company while cross-examining Conterio. No objection was made at that time. Conterio's answer which mentioned insurance tended to discredit Anderson and it would seem that there was some justification for further inquiry along that line by Anderson's counsel. When the subject was pursued on re-cross examination, an objection was offered by defendants and a mistrial requested. The court denied the request and instructed the jury to disregard any reference to insurance. The ruling of the trial judge was proper under the circumstances. Morris v. Montgomery, 229 Mich. 509; and Stehouwer v. Lewis, 249 Mich. 76 (74 A.L.R. 844).

Plaintiff's declaration read in part:

"Plaintiff was an occupant of said motor vehicle which was being driven and operated by defendant Conterio in the performance of his duties as a salesman and/or agent, and was then and there demonstrating to plaintiff an automobile."

The testimony shows that Conterio was what is sometimes characterized as a "bird dog" for Gogebic Company. He owned his own demonstrator which he bought from the Gogebic Company at a discount, and, although he received a commission on all cars sold through his efforts, he was in no way under the control of the Gogebic Company in the performance of his work. Plaintiff's declaration seems to be based upon a principal and agent theory, but Conterio's status was shown to be that of an independent contractor. As to this relationship the jury was properly instructed and its verdict indicates that it was based upon a finding that Conterio was an independent contractor. Under Rule No. 19 of the Michigan Court Rules (1933), plaintiff's declaration can be amended to conform to the proofs, if necessary. Defendant Conterio does not show that he has been prejudiced by any variation between the pleadings and the proofs. As an independent contractor, Conterio is liable for his own torts and, since the proofs show that he was demonstrating the car in his own behalf, Anderson was not a guest passenger. Under this view of the case the verdict and judgment are consistent with the proofs. Upon the finding that the relationship of principal and agent did not exist but that Conterio was an independent contractor, it was proper to enter a judgment in favor of the Gogebic Company and against Conterio, notwithstanding the fact that they were sued jointly. See 1 Searl, Michigan Pleading and Practice, p. 395; Sutton v. Benjamin, 231 Mich. 153.

The damages awarded by the jury as reduced by the court are not excessive.

The judgment is affirmed, with costs to appellee.

CHANDLER, C.J., and BOYLES, NORTH, STARR, BUTZEL, and SHARPE, JJ., concurred. WIEST, J., did not sit.