It is claimed by the plaintiff that it became entitled to the contract price upon doing the work in accordance with the plans and specifications, and that, if leaks occurred within five years after completion, it simply became bound, to remedy them, without prejudice to the right to recover the agreed amount. This contention it is not *234necessary to consider, for we think it was error to take from the jury the question whether, in fact, the work done conformed to the specifications. MacKnight testified that it did, but this was merely a general statement amounting to but little more than his conclusion or opinion. There is no pretense that he was present when the work, or' even the substantial part of it, was done. There is,, in truth, no evidence of the amount of- time which MacKnight devoted to. its 'inspection, nor evidence as to the nature of such .inspection. Under these circumstances, if there were no other proof or attempted proof, we think the question of compliance with the specifications would, at the very least, have been for the jury. A compact and solid floor had been provided for, and a lining of waterproof material for the columns and walls. In spite of this, the water forced its way up through the floor and the base of the walls, and up around the iron jackets to the columns. Plainly, in view of MacKnight’s exceedingly general and inconclusive statements, it was for the jury to say whether this could have happened .if the work had really been done in precise accord with the specifications — especially as there was no bursting of the masonry.
In view, too, of. this state of the evidence, we think expert testimony upon the subject was competent, and that it was error to rule out the testimony of an expert who was familiar with the ground and the surrounding conditions. We refer to the witness Yaughan. He had been in the business of waterproofing cellars for forty-two years, and was fully acquainted both with the plans and specifica•tions and with the condition of these premises, having been a bidder for the contract which the plaintiff obtained, and having thoroughly gone into all these matters in order to make his bid. He was asked to say whether, in his opinion, the cellar could have been made watertight if the plans and specifications had been complied with. The question was excluded, and the defendant’s counsel excepted. Later the learned trial judge seems to have altered his views as to the competency of such evidence, for the architect, Duncan, was allowed to state liis opinion that the cellar would have been waterproof if the work had been done as agreed; that a break the size of a pinhole would have caused the leak, and that the leak occurred because the waterproofing was not intact and continuous. This evidence should have been submitted to the jury for their considera*235tian. It further weakened the-already weak and inconclusive testimony of MacKnight, and it thus strengthened the defendant’s j>osition in requesting the submission to the jury of the question of fulfillment. Of course expert testimony is inadmissible where the matter at issue is the existence or non-existence of a fact cajiable of direct proof, if such proof is supplied. That, however, is not this case.
Nor do we wish to be understood as intimating that plaintiffs, in this class of cases,-must be held to an unreasonable measure of proof. When, to all appearance, work has been done' as required, and fulfills its purpose, general testimony to this effect may and should suffice. But, where the work does not fulfill its purpose, but fails in the very essence of it, the mere general statement of an interested party that he has fulfilled his contract, or testimony substantially to that effect, cannot be treated as adequate even if the opposite party is unable to point out in detail the specific defect.
It is next claimed that whether or not the premises were made watertight, in accordance with the plans and specifications, the plaintiff at least made them dry, and that the defendant thus became liable either by reason of the plaintiff’s inherent right to complete in this manner or on. account of the acceptance by the defendant’s agents of the work so completed. The plaintiff had no such inherent right. It was bound to furnish the defendant with a watertight, not a water-drained, cellar. As the defendant’s counsel well states : “ The specifications were minutely drawn for the purpose of providing a resistance to the water pressure, not to relieve it.” The premises are only dry when the ejector is working, and, if that apparatus should wear out or become damaged, it would be necessary to take up the floor and put in another. Speculation as to whether the new arrangement is as beneficial or convenient to the defendant as that contracted for is quite out of place. It is plain that the conditions are not the same, and it is not for the court to determine whether they are as favorable or not. The defendant contracted for a particular thing, and was entitled to get that and not a substitute for it.
The defendant’s agents never gave the plaintiff this right to vary the contract and to substitute a makeshift for performance. They could not have done so, for the Consolidation Act (Laws of 1882, *236chap. 410, § 64), while providing that contracts are to be made by heads of departments, requires that they shall “be founded on sealed bids or proposals,” and the specifications, forming part of the bid in this ease, could not have been departed from' even by the commissioner who executed the contract upon behalf of the city (Bonesteel v. The Mayor, 22 N. Y. 162); but, in fact, no agent of the defendant consented to accept the use of the ejector as a fulfillment of the contract, nor did MacKnight insist, as á condition of putting it in, that it should be accepted as full performance.
Finally, there was no acceptance of the work as done constituting a waiver of the defect, or any conduct estopping the defendant.from now insisting upon the non-fulfillment. On March SO, 1896, Commissioner Oollis wrote to the architect in answer to a number of letters from the latter as to the condition of the court house building. In this letter he stated that there could be no further delay; that it was necessary to take possession of the building; that this should be done, and the use of the ejector continued, without prejudice to the defendant’s rights against the plaintiff, and that no certificate should, .for the present be given to the latter. Accordingly, possession was taken, and boilers, coal bins, engines and electric-light apparatus put in. There was here no acceptance of the work.. The commissioner simply acted upon the existing condition of things. This was his plain duty. There was nothing in his determination at that late day to take possession of the building and to make it ready for occupancy which can change or qualify the defendant’s right to insist upon the fact of non-fulfillment. Such right would be affected only by an actual, voluntary acceptance of the work as a fulfillment of the contract, with an express or implied promise to pay therefor. There is nothing of the sort here.
We think, therefore, that the questions presented by the defendant’s requests should have been submitted to the jury, and that the direction of a verdict was error.
The judgment should be reversed and a new trial ordered, with costs to the appellant to abide the event.
■ Van Brunt, P. J., Rumsey, Williams and Patterson, JX, concurred.
Judgment reversed, new trial ordered, costs to appellant to abide event.