(after stating the facts). — Brown’s Island, referred to in the contract between the parties to this suit, is situated in the Willamette River about two miles above Salem, and there is no way of getting produce therefrom except by one of the steamboats plying on the river; nor is there any warehouse or building on the island at the boat landing in which such produce can be stored awaiting shipment, but it must be put on board a boat immediately after its delivery at the landing in order to protect it from damage by the elements.
1. On the trial of this action, defendants gave evidence tending to show that it is and was, at the time of the contract in question, the general custom or usage for the purchaser of produce on the island, and especially *323potatoes, to furnish the steamboat for the shipment of such produce, and notify the seller of the time the boat would be at the island to receive it, and for the seller to await such notice before preparing and delivering the produce at the landing for shipment, and that such contract was made with reference thereto; and that plaintiffs knew of this custom and usage at the time the contract was made, but failed and neglected to furnish the boat or notify defendants to prepare the potatoes for shipment until after the flood or high water by which the potatoes were lost or destroyed. Plaintiffs contend this evidence is incompetent and immaterial, because it seeks to import into the written contract terms and conditions not contained therein.
We begin by saying that where the terms of a contract are explicit and free from ambiguity, it is always to be construed according to the strict, plain, common meaning of the words used, and proof of a custom or usage inconsistent with its terms, is inadmissible either to contradict or qualify its provisions, for in such case the terms of the contract are evidence of the intention of the parties to avoid the effect of such usage or custom: Brown v. Foster, 113 Mass. 136 (8 Am. Rep. 463); Collender v. Dinsmore, 55 N. Y. 200 (14 Am. Rep. 224); Atkinson v. Allen, 29 Ind. 375. Custom and usage are resorted to only to ascertain the intention and meaning of a contract when the same cannot be ascertained from the language used, but never to contravene the express terms or stipulations: McCulsky v. Klosterman, 20 Or. 108 (25 Pac. Rep. 366). But where a contract is silent as to details, custom and usage may be resorted to for the purpose of supplying such details or annexing incidents to the contract, provided the details or incidents sought to be imported into the contract are not inconsistent with its express terms, or any necessary implications from those terms, and do not contravene the positive requirements of the law or some principle of public policy: Barlow v. Lambert, 28 Ala. 709 (65 Am. Dec. 374); Sawtelle v. Drew, 122 Mass. *324229; Dawson v. Kittle, 4 Hill, 107; note to Wigglesworth v. Dallison, 1 Smith’s Leading Cases (7 Am. ed.), 904.
“It has long been settled,” says Baron' Parke, in Hutton v. Warren, 1 Mees & Wels. 466, “that in commercial transactions, extrinsic evidence of custom and usage is admissible to annex incidents to written contracts, in matters with respect to which they are silent. The same rule has also been applied to contracts in other transactions of life in which known usages have been established and prevailed, and this has been done upon the principle of presumption that in such transactions the parties did not mean to express in writing the whole of the contract by which they intended to be bound, but a contract with reference to those known usages. ” So in Sawtelle v. Drew, 122 Mass. 229, Lord, J., says: “A custom, within the meaning of the law, if general, is incorporated into and becomes a part of every contract to which it is applicable; if local, of every contract made by parties having knowledge of or bound to know its existence. ”
2. The contract in question here is silent as to the consignee or place of destination of the potatoes, and as to who should procure or furnish the boat upon which the same were to be delivered or shipped; hence proof of usage or custom, if any prevailed, is admissible to supply these details upon which the contract is silent, if such usage or custom was known to the plaintiffs at the time the contract was made.
3. Objection was also made to the competency of the testimony of witnesses Herron and Whitaker, as evidence tending to prove custom or usage, because their knowledge was derived largely from their own experience and course of dealing. Both these witnesses testified that it was the general custom for the purchaser of produce on Brown’s Island to furnish the boat upon which the same was to be shipped, and give notice to the seller when the boat would be at the island to receive the freight, and for the seller to await such notice before putting the produce on.the river bank for shipment. Herron was and had been *325for about three years an agent of some steamboat company at Salem, and had purchased and shipped potatoes from Brown’s Island, and from his own experience and observation of the practice of others, he was able to testify as to such custom or usage. Whitaker had lived on Brown’s Island for about ten years, during which time he had been engaged in raising and selling potatoes, and his evidence was to the same effect. This evidence was, we think, competent. Custom or usage is a matter of fact, and not of opinion. It is proved, not by witnesses testifying as to their opinions, but as to its existence from facts within their own knowledge, obtained by observation of what is practiced by themselves and others in the trade or business to which it relates: Lawson on Usage, § 55; Haskins v. Warren, 115 Mass. 535; and it is no valid objection to the competency of a witness, that his knowledge is derived from his own business, if the knowledge thus derived is sufficiently extensive to enable him to testify to the fact of usage or custom: Hamilton v. Nickerson, 13 Allen, 351.
4. The court, after instructing the jury in effect that by the terms of the contract the title to the potatoes in question remained in defendants, until sacked, weighed, and delivered aboard a steamboat by them, and consequently they must bear the loss, unless such delivery was prevented and loss sustained through the fault or negligence of the plaintiffs, in which case defendants would be entitled to recover the balance due on the purchase price less the cost of sacking and delivering them on the boat, proceeded to give the following instruction: “In this case, under the contract in question, there is no designated consignee of the potatoes, which were the subject of the contract. It is provided therein that they were to be weighed on Brown’s Island before they were received. It is a fair inference from these provisions of the contract that the plaintiffs would have some person there to see to the weighing of the potatoes, and to provide for their shipment. If they failed to do so, and the *326defendants were ready and able to deliver them at a suitable time before they were destroyed by the flood, it would be the fault of the plaintiffs, and they would be to blame for the nonfulfillment of the contract on the part of the defendants.
We do not think the contract in question, by its terms, or by any reasonable inferences therefrom, imposed an obligation upon the plaintiffs to have a person present at the time of the shipment to see to the weighing of the potatoes. By the express terms of the contract, defendants were to sack and deliver the potatoes aboard the boat as fast as the weather would permit. This duty, with which plaintiffs had nothing to do, was, according to the opinion of the trial court, an obligation assumed hy them as a condition precedent to a complete sale. From the language of the contract, in the absence of a known custom or usage governing in such cases, it would seem to be the duty of defendants to deliver the potatoes aboard some steamboat to be selected by them plying on the river as a common carrier as soon as it could safely be done, and when so delivered their contract would be fulfilled and the title vest in the plaintiffs. The weighing of the potatoes was to be done before the delivery aboard the boat, and as defendants were to make such delivery as soon as the weather would permit, they were necessarily authorized to do the weighing themselves, if plaintiffs did not see proper to have some one present to assist in the matter. Whether the weighing so done by defendants would be conclusive between the parties as to the quantity, is immaterial at this time; but it is clear that the failure of plaintiffs to have a person present to see to the weighing and shipment was not a violation of the contract on their part, and would not give defendants a right of action against them for the loss of the potatoes.
Nor can we agree with counsel for defendants in his contention that this was a harmless error. The main question at issue between the parties to this action is, whether there was a general custom or usage known to *327plaintiffs at the time the contract was entered into, which made it their duty to furnish the boats upon which the potatoes were to be delivered. Upon this question the evidence was conflicting, and yet, by the instruction referred to, it was taken from the jury, and they were in effect told to find for defendants, whether such custom existed or not, and without regard to who was to furnish or procure the boat for the shipment of the potatoes, for it was conceded that plaintiffs did not at any time prior to the loss of the potatoes have anyone on Brown’s Island to see to the weighing or shipment, and for this failure tbe court instructed the jury that plaintiffs were responsible for the non-fulfillment of the contract, and, as a consequence, for the loss of the potatoes. Although the jury may have been satisfied from the evidence that there was no custom or usage known, to plaintiffs requiring them to furnish the boat upon which the potatoes were to be delivered, yet under this instruction they were necessarily bound to find for defendants, because plaintiffs did not have some person to see to the weighing and shipment of the potatoes.
The other assignments of error we do not deem it necessary to consider at this time, as they will probably not arise on another trial.
Judgment reversed and a new trial awarded.