delivered the opinion of the court.

The subject.to which the controversy relates is an article known in commerce as argols.

*198 Sect. 5 of the act of Congress of July 14, 1862 (12 Stat. 547), imposed upon ‘‘argols or crude tartar” a duty of “six cents per pound.”

Sect. 22 of the act of July 14,1870 (16 Stat. 266), exempted “ argols crude ” wholly from duty, by putting the article in the-free list created by that act.

Both these acts were in force when the importations in question were máde.

The controversy between the parties therefore narrows itself down to the question whether the argols of the plaintiffs upon which the duties ■ complained of were exacted and paid were “argols crude” or not. If crude, they were not dutiable, and tlie plaintiffs were entitled to recover; otherwise, the defendant was entitled to a verdict in his favor.

The subject was a proper one to be enlightened by evidence and passed upon by the jury. Both were done, and a verdict and judgment for the defendant was the result.

When wine ferments, certain deposits cling to the sides or fall to the bottom of the casks. These deposits are mingled with a variety of impurities, such as glucose, leaves, sticks and particles of dust, silicate and other like things. By washing in cold water, these impurities are removed and the crude tartar is- left free from their presence. The effect of the cold water is mechanical. When boiling water is applied sufficiently, crystallization and l’e-crystallization take place, and the product is the cream of tartar of medicine and commérce. There is refinement in the latter case, but mo chemical change is wrought. ■ Argols are used also for making tartaric acid, Rochelle salts, the preparation of tartrate of antimony, and,potash called tar-tar emetic, as a mordant in dyeing, and for other purposes. Argols and crude tartar are synonyms. The phrases are used convertibly by ihose who deal in the article.

The lexical definition of crude is: “In itá natural state; not cooked or- prepared by fire or heat; undressed; not altered, refined, or prepared for use by any artificial process ;• raw.” See Webster’s Die.

Upon the trial the plaintiffs produced and identified samples of argols of the several -importations hpon which the duties were paid, and gave proof tending to support their case. The *199 defendant then gave proof tending to maintain the claim of the government.. The testimony of the witnesses on both sides is set out at length in the bill of exceptions. ' That paper then proceeds: “ A large number of witnesses were called by the defendant from the trade and from among the manufactures of cream of tartar, and dealers and others, whose testimony tended to prove that there was an article of commerce and importation unlike the plaintiffs? samples which was in fact ‘ crude argols; ’ that the plaintiffs’ samples exhibited at the trial were not 1 crude argols; ’ that said samples differed from • ‘ crude argols,’ &c. . . . These witnesses also testified uniformly that' plaintiffs’ samples' were refined argols, and in that there was a difference between them and crude argols, &c. . . , Samples of ‘ crude argols ’ were exhibited which differed as above stated from those exhibited by the plaintiffs. Also, that there was a difference between crude argols and the fees of wine, and. that all these differences were well understood by the trade and. by. manufacturers.”

The court, after recapitulating with entire-fairness the substance of the testimony, said to the jury: “The only question for you to determine is whether these argols were ‘ argols crude,’ those known to commerce as such or those known to science as such, or whether they were argols that were more or less refined.”

. This instruction was clear and accurate, and it covered the entire ground of the controversy. Nothing more Avas necessary to be said. No amount of verbiage would have improved it, The jury, could have no difficulty in applying it intelligently t.o the facts before them.

They knew from the evidence that if there were no substam tial change in the condition of the argols, as they were when they came from the wine cask, they were crude. On the other hand, if .there were such change wrought by a process to which the argols were subjected, they lost their identity, and took their place-in a new and different category.- According to the nomenclature of commerce, they ceased to be-crude, and became refined. They could not be both at the same time. The measure of refinement was of no consequence, provided it Avas sufficient to be material. The elaborate brief submitted for the *200 government shows that, in the customs laws passed from time to time by Congress, exact analogies to the case in hand have constantly occurred and are numerous. It is unnecessary particularly to advert to them.

In cases like this, the law recognizes the authority of those engaged in commerce, and adopts, necessarily and as conclusive, the meaning which they have given to words and phrases employed in their daily business.

It is needless to notice specifically the several assignments of error. They relate to the instruction given, and to several asked by the counsel for the plaintiffs and refused by the court. As regards the former, we have expressed our approval.

If the latter were in conflict with it, they were properly refused for that reason.

Conceding that they were correct, the instruction given was sufficient for the case. Nothing more could, therefore, be required of the court. National Bank v. Burkhardt, 100 U. S. 686.

Judgment affirmed.