The defendants appeal from a judgment entered on a jury’s special verdicts. See Mass.R.Civ.P. 49(a),
On the basis of the record, the jury could have found the following facts: In January, 1975, the defendant Mel-pet Stables, Inc. (Melpet), which operated a stable for the sale, exchange, schooling, boarding and letting of horses for riding, hired the plaintiff as a laborer. The defendant Melanson was the treasurer and manager of Melpet. In May, Melanson directed the plaintiff to pick up the horse of one Coffin for boarding. Sometime after the Coffin horse was boarded at Melpet, the plaintiff saw it rear *327 while Coffin’s daughter was riding it. The plaintiff reported the incident to Melanson, who suggested that the plaintiff tell Coffin about it. Coffin agreed with the plaintiff to pay for the necessary "schooling” of the horse. The plaintiff, in undertaking to school the horse, acted under an independent agreement with Coffin. At the time of the plaintiff’s injury, Melanson, who had been training horses for more than forty years, was present and directed the lesson. Under his direction, one Bishop, another employee, worked with the horse. The horse proved a recalcitrant pupil and threw Bishop three times. Melanson directed the plaintiff into the saddle and instructed him in what to do when he got there. The plaintiffs stint as equine teacher came to an abrupt and unhappy end when the horse reared and fell on him. That mishap resulted in back injuries to the plaintiff.
The plaintiff brought an action against both Melanson and Melpet, alleging that they were negligent (the latter through its agent, Melanson) in the supervision and direction of the schooling of the horse, and that he was injured as a consequence of their negligence. 3 The case was referred to a master; hearings began April 22, 1976, and were concluded July 15,1976. In his final report the master found that the plaintiff was employed by the defendants, that he was injured in the course of his employment, that the defendants failed to carry workmen’s compensation insurance, and that the defendants were negli *328 gent. The defendants’ motions to strike the master’s report were denied. After the jury trial, the defendants’ motions for judgment notwithstanding the verdict and for a new trial on the negligence issue were also denied.
1. The defendants urge that they were surprised by the fact that the judge instructed the jury on the issue of negligence, having expected, they say, only a charge on the employer-employee relationship. In view of the allegations of negligence in the plaintiff’s complaint, particularly directed to Melanson’s directions of the schooling of the horse, it is difficult to credit the defendants’ argument. In any event, the defendants failed to object to the fact that the judge had instructed the jury on the alternate negligence theory, and so the issue may not now be raised on appeal. An appeal based on erroneous instructions can be made only if objections to the instructions were raised at trial. Ses Mass.R.Civ.P. 51(b),
2. As to the defendants’ assertion that the record lacks evidence of negligence on the part of the defendants, our examination of the record discloses ample support for the jury’s finding of negligence. The master had made a finding of negligent direction of the horse’s tutorial by Melanson. Under Mass.R.Civ.P. 53(e)(3),
Although prima facie evidence ’’may be met and overcome by evidence sufficient to warrant a contrary conclusion”
Anderson’s Case,
But if, the defendants argue, the plaintiff was acting under an independent contract with the owner of the horse at the time of his injury (as the jury found), then Melanson’s instructions constituted a "gratuitous undertaking” for the plaintiffs benefit. Under such circumstances, liability could not be imposed on either defendant, if Melanson’s conduct constituted only ordinary negligence; it would have to amount to gross negligence or wilful, wanton or reckless conduct.
Massaletti
v.
Fitzroy,
The jury could reasonably find the defendants liable for ordinary negligence on the evidence. They had the master’s findings. They heard testimony that Melanson operated the stables, had vast experience with horses, and had agreed to board the Coffin horse. Melanson was the plain *330 tiff’s boss. The plaintiff could not have schooled the Coffin horse without Melanson’s permission. Melanson’s presence and active involvement in supervising the schooling of the horse were designed to maintain a business advantage. The finding that the plaintiff acted under an independent contract at the time of his injury does not require a different result. Cf. Restatement (Second) of Torts § 410 & Comment c (1965).
3. The master’s report was timely filed, and hence was properly introduced in evidence at trial. Under Mass.R.Civ.P. 53(e) (1), as amended,
4. The defendant argues that a photostatic copy of a statement signed by Melanson was improperly received in evidence because of the best evidence rule and the fact that the signature was not authenticated. Melanson, however, acknowledged his signature on other exhibits in evidence and the jury were competent to draw their own inferences as to the authenticity of the offered writing by comparing it to the signatures which Melanson had admitted as genuine.
Noyes
v.
Noyes,
The “best evidence” rule is preferential, not exclusionary.
Fauci
v.
Mulready,
Judgment affirmed.
Order denying motion for new trial affirmed.
Notes
The jury found, among other things, that the defendants were 90% negligent, that the plaintiff was 10% negligent, that the plaintiffs damages amounted to $62,000 from each defendant, and that the plaintiff was acting under an independent agreement with a third party at the time of his injury.
Two theories of liability were asserted, one based on negligence and the other on the employer-employee relationship. Had the jury found that the plaintiff acted as an employee, G. L. c. 152, § 66, would have governed the rights of the parties, assuming, as the parties apparently did, that the employer should, but did not, become insured for workmen’s compensation. That statute provides, inter alia, that in an action for a personal injury incurred in the course of employment, it shall not be a defense that the employee was negligent or that the employer was not negligent. See
Barrett
v.
Transformer Service, Inc.,
Indeed, the plaintiffs injury apparently convinced Coffin that the horse was too dangerous for his daughter. He had it removed from Melpet Stables and sold.
When they failed to object to the denial of their motions to strike the master’s report, the defendants lost the right to raise the issue of timeliness in any event.
