The verdict settles the question of debt in favor of plaintiff unless some error was committed during •the trial. The plaintiff testified in favor of Ms claim and the defendant’s testimony was in conflict with the jDlaintiff’s. Each side introduced other witnesses in support of his statement, all of wMch was considered by the jury. The defendant insisted that his promise was void (Code, sec. 1552), as a promise to pay the debt of another. The plaintiff was allowed to prove by the defendant’s witness the custom of keeping books in that section, where goods are furnished at the request of a third party, when the third person is a landlord of him to whom the goods are to be furnished, and the defendant excepted. The competency of this evidence is the principal question in the case. We think the evidence was corroborative, and in that view competent. The plaintiff had testified positively, and the defendant’s evidence tended to impeach the plaintiff’s testimony, and the usage and method of keeping accounts in such cases were circumstances which might aid the jury in arriving at a just conclusion. Such custom and usage have been held competent. 1 Greenleaf Ev., secs. 116 and 118; Harrison v. Hall, 124 N. C., 626. Plis Honor told the jury that, if the defendant author*525ized the selling to the son, the plaintiff could recover, although the goods were charged to J. B. Tripp in the manner stated in the case. He also charged the jury on the law of principal and agent, and that if the credit was given to J. B. Tripp, with Joseph Tripp as surety, then the defendant would not be liablo. There is nothing in these instructions of which the defendant can justly complain. The promise, as the jury have found it to be under the charge, is not required to be in writing. Neal v. Bellamy, 73 N. C., 384.
The liability of the defendant depends upon his agreement with, or promise to, the plaintiff, and not upon the manner in which the plaintiff stated the account on his books. The latter was evidence, properly before the jury, under the circumstances, and for the purpose already stated.
Affirmed.