appeal to the Appellate Division by the seller, the defendant in the arbitration. The Appellate Division held by a divided court that in respect of a separable provision the award was in excess of the powers of the arbitrators. Buyer and seller, plaintiff and defendant, had been directed to proceed to arbitration in accordance with the contract. The powers of the arbitrators were thus measured by the contract, and did not extend to controversies beyond the terms of the submission. There was power to determine the fact of performance or nonperformance by one party or the other. There was no power to assess the damages resulting to the buyer’s business by reason of the breach. The judgment was, therefore, modified by strildng out the award of damages, and as modified affirmed.
Cross-appeals are now before us. The seller, the defendant in the arbitration, is dissatisfied because the award has been allowed to stand as an adjudication of its fault. The buyer, the plaintiff in the arbitration, is dissatisfied because the damages, if there have been any, must be assessed and recovered through proceedings in the courts.
(1) The appeal by the defendant is a challenge to the order directing arbitration. The challenge must be heeded even now if the order is merely void, an assumption of unlicensed power. The award can be no stronger than the prop on which it rests. The challenge comes too late, however, if power being present, there has been merely error in the use of it (Fauntleroy v. Lum, 210 U. S. 230, 235; Marin v. Augedahl, 247 U. S. 142, 149; Wagner Co. v. Lyndon, 262 U. S. 226, 231). An order for the specific- performance of an agreement to arbitrate a controversy is one that finally determines a special proceeding (Hosiery Manufacturers Corp. v. Goldston, 238 N. Y. 22, 25, 26). The proceeding thus ended is not a part of the arbitration that is thereby set in motion. It is subject to direct review as a separable controversy.