Opinion by
Me. Justice Moschzisker,The plaintiffs sued to' recover on a written contract with the City of Reading for the construction of filter beds, claiming $23,780.09; they obtained a verdict for $15,831.02, upon which judgment was entered, and defendant has appealed.
About three fourths of the amount sued for represents the contract price of additional work and material furnished by plaintiffs, which entered into the construction of foundations and flooring of the filter beds; and the remaining one-fourth, the stipulated price of additional concrete used by plaintiffs in erecting the roofs of these beds. We shall consider the two items of claim separately and in the order named.
As to the first item, the contract in questiofi provides, inter alia: “Wherever excavations are carried on beyond the lines and grades furnished by the engineer, the contractor shall, at his own expense, refill such places with concrete or other material selected by the engineer. Wherever materials are encountered which are not suitable for supporting the structures, the excavation shall be carried to such additional depth as may be specified by the engineer. Excavation and concrete necessary for such additional depth will be paid for [by the city] at the prices bid [by the contractor] for excavation and concrete masonry.”
At the trial, plaintiffs claimed and gave evidence to prove that, during the course of preparing the grounds for construction of the beds, defendant’s engineer in many instances determined that rock material “encountered” was not suitable “for supporting the structures,” and, for that reason, directed the excavations be carried to additional depths specified by him; that, *103in obedience to' and in accordance with these directions, they, the plaintiffs, were obliged to make additional excavations to the extent claimed for in this suit. On the other hand, the defendant contended and presented evidence to prove that, whenever its engineer decided that materials encountered were not suitable for support, and ordered additional excavations, these were allowed and paid for; that as a matter of fact the particular additional excavating here in question was necessitated by the negligence of plaintiffs in blasting out rock, and was not in any sense caused by “encountering” unsuitable “material.”
Thus clear issues of fact arose, which were tersely and properly submitted to the jury. The defendant contends, however, that no evidence should have been received on these issues, and that they ought not to have been submitted to the jury, because of two clauses contained in the written contract: (1) A provision to the effect that “the decision of the engineer shall be final and conclusive in all disputes and disagreements which may arise between the parties to this agreement”; (2) A stipulation that “the engineer shall in all cases determine the amount or quantity of the several kinds of work which are to be paid for......and the......compensation to be paid,” and certify accordingly.
In receiving testimony and charging the jury, the learned trial judge properly acted upon the theory that the engineer, when rendering his decisions, was “bound to......give due effect to the terms of the contract and not......to depart- from them or substitute something else in their place”; and, therefore, whenever additional excavations were made because materials were encountered which were not suitable for supporting the structures, and these excavations were' carried to depths specified by the engineer, the latter, under the terms of the contract, was obliged to make allowances of extra compensation to plaintiffs, at the prices named in the agreement (citing Drhew & Beel v. Altoona, 121 Pa. 401; *104Coryell v. Dubois Boro., 226 Pa. 103). .Again, in refusing judgment n. o. v. the court below properly sustained the theory upon which the case had been tried, and correctly held that the “disputes” involved were really between the contractors and the engineer, as to whether or not the latter had specified the additional depths in question and concerning his stated reasons for so doing, if done; and since there was no denial as to the execution of the work in question or as to the prices tó be paid therefor, if any, the court below did not err in applying the principle laid down in Smith v. Cunningham Piano Co., 239 Pa. 496, 501, and the authorities there cited, governing cases of this kind.
The syllabus of the Smith case states the rule thus: “Where......the controversy is mainly as to the conduct of the architect himself, there being evidence tending to show that he was capricious and unreasonable in refusing to approve of work that had been done in strict accordance with his directions, the question is for the jury, and the latter is properly instructed that the arbitration clause in the......contract referred to questions arising between the contractor and owner, and not to questions that concerned the performance of duties by the architect himself.” Here, if as a matter of fact the excavations claimed for were made on and in accordance with the order of the city engineer, after his decision that materials had been encountered which were “not suitable for supporting the structures” (and the jury has so found), it follows as a matter of law that plaintiffs would be entitled to payment; and a refusal of the engineer so to certify would not be the exercise of arbitral jurisdiction, but simply a capricious attempt to deprive plaintiffs of their contractual rights. Hence, notwithstanding the arbitration and certificate clauses contained in the written agreement, the case was for the jury, to determine the beforementioned facts regarding the conduct of defendant’s engineer.
In view of the conclusion just stated, it becomes un*105necessary to consider the other point discussed in the paper books, as to whether or not, since the contract contains a provision that the engineer’s payment certificates shall be subject to review and correction by a board representing the defendant city, the arbitration and other clauses above referred to could, under any circumstances, interfere with the right to trial by jury.
On the second branch of the case, concerning plaintiffs’ claim for additional concrete entering into the construction of the filter-bed roofs, the written agreement provides, inter alia, that concrete shall be “wetted and mixed to form a stiff paste”; but plaintiffs claim defendant’s engineer compelled them to mix it in a loose, liquid state, that the prescribed molds for holding the substance were not adapted to this fluid condition, and, hence, that the use of a greater quantity of concrete became necessary. The contract stipulates, where quantities shall be increased from any cause which may enhance the expense of construction, “such increase shall be paid for at the rates herein provided.”
In disposing of the claim in hand, the court below well says that the charge explicitly limits the jury’s allowances on this account to occasions where the necessity for increasing the quantity of concrete arose purely from a change in the consistency thereof ordered by the city’s engineer, and forbids allowances where the use of additional material was traceable to any shortcomings or omissions on the part of plaintiffs themselves; and President Judge Endlici-i adds: “It is by no means clear, from the size of the verdict rendered, that the jury allowed plaintiffs anything on this item of their demand, but, if they did, the allowance must be presumed to have been made in accordance with these instructions.”
As stated by the court below, the verdict strongly indicates that the jury made no allowance to plaintiffs on account of the present item of claim; but, be this as it may, after carefully reading all the testimony, we are not convinced of the inapplicability to this branch of *106the case of the principles already stated in onr consideration of the subject of the additional excavations, or that harmful error was committed in submitting the issues involved to the jury.
The assignments are overruled and the judgment is affirmed.