delivered the opinion of the Court:
1. With respect to the admissibility of the testimony of Harries, Smith and Davis, we do not think that the appellant has any reasonable ground of complaint. It is the dictate of reason that the existan ce of a certain state of *319facts at any particular time can be shown by proof of the conditions existing immediately before or after that time, when in the nature of things the conditions at the precise moment of time cannot be shown, and the circumstances are such that any reasonable mind will infer from the conditions that are shown to exist their continuance or pre-existence. How otherwise than by such testimony as was offered could it have been shown that there were obstructions in the sewer at the time of the overflow ? It would never have occurred to anyone, other perhaps than the agents and employees of the appellant, to whom probably it ought to have occurred, to make an investigation of the sewer in anticipation of such an overflow. The place of obstruction was not open to public observation ; and ordinarily it was only by subsequent investigation and by deductions from existing results that the cause of disaster could be ascertained. The space of four days was a sufficiently short period of time, in connection with proof of the character of the obstruction that was found to exist, to justify the inference of the pre-existence of the obstruction at the time of the injury. It was open to the appellant to controvert the presumption by any proper proof; but that this testimony on behalf of the appellee was competent and relevant, we do not hesitate to affirm. In this ruling we are supported by abundant authority. Phillips on Evidence, vol. 1, chap. X; Grand Trunk Railroad Co. v. Richardson, 91 U. S. 454; Penn. Railroad Co. v. Stranahan, 79 Penn. St. 405; Greenleaf on Evidence. It is only the ordinary case of reasoning from effect to cause, and from cause to effect.
2. The appellant’s second assignment of error, on which apparently most reliance is placed, is that the court below did not grant the defendant’s first prayer, which requested a direction to the jury to return a verdict for the defendant.
The argument of the appellant, in this connection, is, in substance, that it has demonstrated mathematically that it was impossible for the Tiber Creek sewer to carry off the *320•immense rainfall of this occasion without overflow. But unfortunately for the argument, it was one that should have •been, and no doubt was, addressed to the jury. The argument depends on an assumption of premises that are not mathematical, as, for instance, that the whole rainfall reached the sewer at once, and that the measurements of the appellant’s experts are correct — facts which it is for the jury to determine. And even if the alleged mathematical demonstration be taken as correct and conclusive, it proves nothing in this case. It is admitted on both sides that there was an immense and extraordinary rainfall on this -occasion; but the burden of the plaintiff’s claim is that the defendant’s negligence was a concurrent cause of the injury, and in fact the proximate cause ; that a mere overflow of ■comparatively pure rain water would not have so greatly injured him ; and that there was no such volume of water in the sewer at any time during the occurrence as would have •caused the overflow in the absence of obstruction occasioned by the negligence of the defendant. The plaintiff undoubtedly proved a prima facie case of negligence on the ■part of the defendant — a case that, in the absence of any ■proof by the defendant, would have justified a verdict by the jury. If the defendant has overcome that case, as it •claims to have done, by vastly preponderating testimony, by testimony amounting to mathematical demonstration, .according to the contention of counsel, it is not proper •even then for the court peremptorily to instruct the jury to return a verdict for the defendant. In the case of Warthen v. Hammond, 5 App. D. C. 167, decided last January, we had occasion to state what we regarded as the proper rule in such cases. There we said:
“It maybe laid down as a general rule, subject perhaps to some exceptions or qualifications, that when the plaintiff has adduced testimony fairly tending to prove a prima facie ■case in his favor, and which, in the absence of testimony on behalf the defendant would entitle him to solicit a verdict from the jury, the court may not withdraw his case from the *321consideration of the jury, no .matter what the testimony for the defendant may be.”
While testimony on behalf of the defendant may be regarded as vastly preponderating, it is for the jury to pass upon it, not for the court; and the jury may not be disposed to credit. It is not only the right, it is veiy often the duty, of a trial court to set aside the verdict of a jury whenever it has good reason to regard that verdict as be-in opposition to the just preponderance of evidence; and we have no desire here to .place any limitation upon the ■frequency with which in any given case that may be done. But we cannot as a matter of law affirm that in any case, where there is a prima facie sufficiency of testimony on the part of a plaintiff, but an apparent preponderance on the part of a defendant, the trial judge would be justified to instruct the jury in advance peremptorily to return a verdict in fovor of the latter. We think that to do so would be •to invade the province assigned to the jury in our system ■of jurisprudence.
It is our opinion, therefore, that the court below was entirely right in refusing the peremptory instruction requested by the appellant. At the same time, we do not desire to be understood as intimating that, in our opinion, there was any such preponderance of testimony as is claimed by the .appellant.
3. Exception was taken by the defendant to the granting ■of the plaintiff’s fifth, seventh, eighth, eleventh and twelfth requests for instructions. These instructions need not here be set forth in detail. The question which the appellant .seeks to raise from them, is that it should not be charged with negligence in respect of the alleged obstruction in the .sewer, without actual notice of the existence of such obstruction, and consequently an opportunity for its removal in due time.
Undoubtedly, a municipal corporation, in the multitude .and variety of the duties imposed upon it, should not be .held to liability for anything which it could not reasonably *322have anticipated. And when an obstruction exists which it is its duty to prevent or remove, and which has been occasioned by any other power than its own, its officers and agents should have a reasonable opportunity to procure the removal, before it can be held liable for negligence for its failure to act. But in a case like the present there seems to be no ground for the application of the doctrine of notice in its ordinary sense. Ordinarily and in the nature of things, only the officers and agents of the municipality could know of such an obstruction as that of which complaint is here made. There could be no passers-by who could give information. The locality of the obstruction was open only to the employees of the municipality, and it was their duty to inspect it from time to time and to ascertain the fact that no obstruction existed. Only by such inspection was it possible ordinarily to ascertain the existence of obstructions ; and if that work of inspection was neglected by the municipality, it has no right to require that it must have notice through some other source. Its neglect of duty cannot be made the basis of exemption from liability. If it had performed the work of inspection properly, it would have had due notice that the obstruction existed, if it did exist; and whether it performed the work of inspection, was a question for the jury.
This case, of course, is plainly distinguishable from the case of obstructions placed in the streets by others than the officers or agents of the municipality; and it is unnecessary to expend time to show the difference between the two classes. Decisions applicable only to the latter have no bearing upon the former. The decision of the Supreme Court of the District of Columbia in the case of Bannigan v. District of Columbia, 2 Mackey, 285, was rendered in a case where it was sought to hold the District of Columbia liable for damages resulting from the faulty construction of a sewer, and the notice, which it is stated there that the District should have had before being held to liability, must be construed to be merely notice of the faulty construction *323—that is, of the error of judgment that was committed by its engineers. We do not regard that case as applicable to the present.
4. The only other exception which we deem it necessary to notice, is one taken to the refusal of the trial court to grant the twelfth instruction requested by the appellant. This had reference to the Maine avenue sewer, a small lateral sewer, discharging into the Tiber Creek sewer and is as follows:
“If the jury believe from the evidence that the flooding of the plaintiff’s premises on the first of July, 1889, and the 31st of July, 1889, or the 1st of August, 1889, occurred by reason of incapacity in the Maine avenue sewer to discharge the volume of water which flowed in it on those days, then the plaintiff is not entitled to recover, and your verdict should be for the defendant.”
If this instruction were otherwise unobjectionable and entirely warranted by the evidence, the refusal to grant it was proper, because it had already been granted; and it is manifestly improper to duplicate instructions. The substance of this twelfth instruction had already been incorporated in the fifth instruction granted at the request of the appellant, and which was as follows :
“If the jury believe from the evidence in this case that the Tiber sewer and the Maine avenue sewer respectively were not of sufficient capacity to carry off the rainwater which fell on July 1st, 1889, and July 31st or August 1st, 1889, and that the flooding of the plaintiff’s premises was caused solely by this want of capacity in said respective sewers to discharge said water, and not because either of said sewers was obstructed by sand and gravel, then the plaintiff would not be entitled to recover, and your verdict should be for the defendant.”
We find no error in the record of this case. We think the law of the case was stated fully and fairly by the presiding justice, and with as much liberality as was possible to the appellant. And we think the case one in which, *324under the circumstances, we should, if possible, make an end of the litigation. We are of opinion that the judgment of the court below should be affirmed, with costs. And it is so ordered.