With tbe permission of defendant city a trench was dug in one of its streets for the purpose of supplying heat to the city library building. At the time plaintiff received his injuries this ditch had' been partly filled, but on account of inability to obtain material part of it had been left open, awaiting the arrival of proper material for making connections. Plaintiff charges that this open part of the ditch was unbarricaded and unlighted, and that, while using due care on his part, he on the evening of March 3, 1905, drove into the ditch, receiving the injuries of which he complains. Defendant denied liability on the ground that it had a proper light to warn travelers of the dangerous condition of the street, and that the accident was due to plaintiff’s own fault and neglect. Several proposh tions are relied upon for a reversal, but most of them depend upon the single one that the excavation in the street was a niusance, for which defendant was absolutely responsible to any one injured on account thereof.

*571i. Municipal defect in street: nuisance, *570Whilst the evidence is somewhat meager upon the proposition, plaintiff’s counsel concede in argument that the ditch or excavation was made for the purpose of supplying heat and making connections with some sort of heat*571ing system for tbe library building in tbe defendant city; that tbe ditcb was partly filled, and tbe remainder leit open awaiting material tor • x ° making proper pipe connections. Tbis being true, and tbe excavation having been made ‘ for a proper purpose, it was not in itself a nuisance, and did not become sucb, unless it was allowed to remain open for an unreasonable length of time; and whether so left would ordinarily be a question of fact for a jury. Tbe testimony does not show just when tbe ditcb was dug; but it was open.in part on March 3, 1905, when plaintiff drove into it. Tbe only showing we have is that tbe ditcb was dug some time in February; but at what time in tbe month does not appear. So that we cannot say as a matter of law that tbe ditch was in fact a nuisance.

Sa negligence: instruction. Plaintiff’s case was really bottomed upon tbe thought that defendant did not barricade the opening or light it in the evening, so as to warn and protect travelers from danger. Although tbe excavation was not a nuisance, it was defendant’s duty to barricade or light it, or both; that is, to take sucb reasonable precautions to warn and protect. tbe public as reasonable care and prudence would dictate for the safety of travelers using tbe street. There was no testimony of any barricade; but there was evidence tending to show that there was a warning light burning on tbe evening of tbe accident, although tbis was denied by plaintiff and bis witnesses. In reference to tbis matter tbe trial court gave tbe following instructions: “ If you find from the evidence that on tbe evening of tbe accident in question, and before it happened, a light or lights sufficient to apprise a person of ordinary prudence of tbe existence of tbe excavation was placed at or near said excavation, then tbe defendant was not guilty of negligence, unless it be shown that defendant bad caused said light or lights to be removed, or bad actual notice or knowledge of said removal, and sufficient time *572thereafter to replace the same before the accident.” Whilst this instruction might have been a little better worded, yet we think it properly submitted.to the jury the question as to whether or not defendant exercised proper care in exposing warning lights on the evening when plaintiff was .injured. The instruction left it to the jury to say whether or not defendant on the evening in question had placed at or near the excavation a light or lights sufficient to apprise persons of ordinary prudence.of the existence of the excavation. This was the real issue in the case, and the instruction necessarily involved the thought that the light or lights were sufficient in all respects to apprise persons of ordinary prudence of the excavation. If defendant did this, then it was not responsible, if for some reason and without fault on its part these light or lights were removed without its knowledge, until it knew or should have known of their removal. This states the law as we understand it. Having performed its duty .in the first instance, the city was not required to keep a man on guard to see that the lights were not removed. Whether or not there were sufficient lights displayed on the evening in question' was for the jury; and that matter was evidently determined adversely to plaintiff. There was evidence to support such a conclusion, and we shall not interfere with the finding. The instruction seems to be a copy of the one inferentially approved in Hall v. Town of Manson, 99 Iowa, 704, and there was no error in giving it. See, also, Weirs v. Jones County, 80 Iowa, 351, which fully supports the instruction.

Some other questions are argued, but they have been passed upon so many times by this court that there is no necessity for considering them.

No prejudicial error appears, and the judgment is affirmed.