The'opinion of the court was delivered by

At the trial, after refusing a motion to non-suit, the court directed a verdict against the plaintiff at the close of the case. The suit was based; upon a contract in waiting, between the parties, which provided for the erection by the plaintiff of a sewage disposal works in the borough.

The work was substantially completed as 'plaiaitiff alleges, according to the terms of the contract, but the borough a-e-fused to pay an unpaid balance due on the contract; and also refused to recogoaize a claim for damages arising out of delay by the borough for tha-ee months, in acquiring the locus in quo; and also refused to pay for the increased cost oE performance arising from a mistake in location of the locus, as well as the additional cost entailed, caused by an alleged mistake in the elevation of the works; and also for the cost of certain rock excavation not contemplated or provided for *195in the contract; and finally for the cost and expense of maintenance of the plant after completion and notice- thereof to defendant.

The defendant interposed the defence of failure to complete the work; failure to produce the certificate of the engineer in charge, as required by the contract, as well as failure to produce an order in writing for the alleged extra work, as required by statute, and a general denial of its obligation to recognize the remaining claims.

There was testimony in the case from which a jury might reasonably infer the substantial completion of the contract. As a fact, the plant as plaintiff left it and at the time of the trial, and for almost two years, was in practical operation without any extensive expenditure upon it by the borough, and if any expenditure were necessary to complete it in any contract detail, quite apparently the item involved in the estimation of a jury might not be said to materially diminish the practical efficiency or completion of the plant, and the cost of such detail could easily have been estimated by the jury under the testimony.

Tinder our cases this situation presented a jury question, as to whether there had been a substantial completion of the work, due allowance being made by the jury for the failure of plaintiff to make good in sudh, details of the contract as were evidenced by proper proof. Feeney v. Bardsley, 66 N. J. L. 239. Dyer v. Lintz, 76 Id. 204; Jersey City v. Flynn, 71 N. J. Eq. 104; Anderson v. Odd Fellows Assn., 84 N. J. L. 176.

The same rule is applicable to- the plaintiff’s failure to produce the engineer’s certificate, if the latter unreasonably persisted in refusing it. By repeated adjudications of this court, the rule applicable to such a situation is now-familiar law, that the jury axe the judges of the right of the plaintiff to receive the certificate, in view of the alleged mental attitude of the architect in fraudulently withholding it. Byrne v. Sisters, &c., 45 N. J. L. 213; Chisin, v. Schipper, 51 Id. 1; Landstra v. Bunn, 81 Id. 680.

*196The same rule is applicable to the claims for extra work, a.nd the delay of plaintiff in executing the work, due as alleged to defendant’s procrastination, and also to the item of rock excavation. The testimony upon these subjects presenting the circumstances under which the items of extra work and- rock excavation were performed, manifestly presented a jury question, in a situation not substantially unlike that presented and determined at the present term of this court in Ippolito v. Borough of Ridgefield, ante p. 97, in which we were called iipon to deal with the provisions of chapter 342 of the laws of 1912, as a limitation upon the right of the municipality to enter into collateral .undertakings arising ex ivecessitaste from a bona, fide endeavor to execute the work, under a written contract, without fault upon the part of the contractor, and where the neeessitj'- for the work was due to the action or inaction of the municipality, and was not due to the conduct of tire contractor as its superinducing cause, but rather to unforeseen and unanticipated causes.

We there held that the necessity for the performance of the collateral work, and the bona fide conduct of the contractor in its execution, were questions for the jury. To the same effect also are Norcross v. Wills, 198 N. Y. 336; 13 Cyc. 160, and cases cited.

We think that thie issues in the case were therefore entirely of faqt, and presented a jury question. The judgment appealed from will therefore be reversed and a venire de novo will issue.

For affirmance—Parker, Black, JJ. 2.

For reversal—The Chancellor, Citiee Justice, Swayze, Trenchard, Bergen, Minturn, Kalisoii, White, Heppenheimer, Williams, Taylor, Gardner, Ackerson, JJ. 13.