It appears from the statement in the case [see pp. 267–268], that the coal under the defendants’ land had, at some remote period, been worked out; but this was unknown at the time when the defendants gave directions to erect the reservoir, and the water in the reservoir would not have escaped from the defendants’ land, and no mischief would have been done to the plaintiff, but for this latent defect in the defendants’ subsoil. And it further appears [see pp. 268–269] that the defendants selected competent engineers and contractors to make their reservoir, and themselves personally continued in total ignorance of what we have called the latent defect in the subsoil; but that these persons employed by them in the course of the work became aware of the existence of the ancient shafts filled up with soil, though they did not know or suspect that they were shafts communicating with old workings.

It is found that the defendants, personally, were free from all blame, but that in fact proper care and skill was not used by the persons employed by them to provide for the sufficiency of the reservoir with reference to these shafts. The consequence was that the reservoir when filled with water burst into the shafts, the water flowed down through them into the old workings, and thence into the plaintiff’s mine, and there did the mischief.

The plaintiff, though free from all blame on his part, must bear the loss, unless he can establish that it was the consequence of some default for which the defendants are responsible. The question of law therefore arises, what is the obligation which the law casts on a person who, like the defendants, lawfully brings on his land something which, though harmless whilst it remains there, will naturally do mischief if it escape out of his land. It is agreed on all hands that he must take care to keep in that which he has brought on the land and keeps there, in order that it may not escape and damage his neighbors; but the question arises whether the duty which the law casts upon him, under such circumstances, is an absolute duty to keep it in at his peril, or is, as the majority of the Court of Exchequer have thought, merely a duty to take all reasonable and prudent precautions in order to keep it in, but no more. If the first be the law, the person who has brought on his land and kept there something dangerous, and failed to keep it in, is responsible for all the natural consequences of its escape. If the second be the limit of his duty, he would not be answerable except on proof of negligence, and consequently would not be answerable for escape arising from any latent defect which ordinary prudence and skill could not detect.

Supposing the second to be the correct view of the law, a further question arises subsidiary to the first, viz., whether the defendants are not so far identified with the contractors whom they employed as to be responsible for the consequences of their want of care and skill in making the reservoir in fact insufficient with reference to the old shafts, of the existence of which they were aware, though they had not ascertained where the shafts went to.

We think that the true rule of law is that the person who for his own purposes brings on his lands and collects and keeps there anything likely to do mischief if it escapes, must keep it in at his peril, and if he does not do so, is prima facie answerable for all the damage which is the natural consequence of its escape. He can excuse himself by showing that the escape was owing to the plaintiff’s default; or perhaps that the escape was the consequence of vis major, or the act of God; but as nothing of this sort exists here, it is unnecessary to inquire what excuse would be sufficient. The general rule, as above stated, seems on principle just. The person whose grass or corn is eaten down by the escaping cattle of his neighbor, or whose mine is flooded by the water from his neighbor’s reservoir, or whose cellar is invaded by the filth of his neighbor’s privy, or whose habitation is made unhealthy by the fumes and noisome vapors of his neighbor’s alkali works, is damnified without any fault of his own; and it seems but reasonable and just that the neighbor, who has brought something on his own property which was not naturally there, harmless to others so long as it is confined to his own property, but which he knows to be mischievous if it gets on his neighbor’s, should be obliged to make good the damage which ensues if he does not succeed in confining it to his own property. But for his act in bringing it there no mischief could have accrued, and it seems but just that he should at his peril keep it there, so that no mischief may accrue, or answer for the natural and anticipated consequences. And upon authority, this we think is established to be the law, whether the things so brought be beasts, or water, or filth, or stenches.

The case that has most commonly occurred and which is most frequently to be found in the books is as to the obligation of the owner of cattle which he has brought on his land to prevent their escaping and doing mischief. The law as to them seems to be perfectly settled from early times; the owner must keep them in at his peril, or he will be answerable for the natural consequences of their escape; that is, with regard to tame beasts, for the grass they eat and trample upon, though not for any injury to the person of others, for our ancestors have settled that it is not the general nature of horses to kick, or bulls to gore; but if the owner knows that the beast has a vicious propensity to attack man, he will be answerable for that too.

As early as the Year Book, 20 Ed. 4, 11, placitum 10, Brian, C. J., lays down the doctrine in terms very much resembling those used by Lord Holt in Tenant v. Goldwin, 2 Ld. Raym. 1089, 1 Salk. 360, which will be referred to afterwards. It was trespass with cattle. Plea, that the defendant’s land adjoined a place where defendant had common, that the cattle strayed from the common, and defendant drove them back as soon as he could. It was held a bad plea. Brian, C. J., says: “It behoves him to use his common so that he shall do no hurt to another man, and if the land in which he has common be not enclosed, it behoves him to keep the beasts in the common and out of the land of any other.” He adds, when it was proposed to amend by pleading that they were driven out of the common by dogs, that although that might give a right of action against the master of the dogs, it was no defence to the action of trespass by the person on whose land the cattle went. In the recent case of Cox v. Burbidge, 13 C. B. N. S. 438, 32 L. J. C. P. 89, Williams, J., says: “I apprehend the general rule of law to be perfectly plain. If I am the owner of an animal in which by law the right of property can exist, I am bound to take care that it does not stray into the land of my neighbor, and I am liable for any trespass it may commit, and for the ordinary consequences of that trespass. Whether or not the escape of the animal is due to my negligence is altogether immaterial.” So in May v. Burdett, 9 Q. B. 112, the Court, after an elaborate examination of the old precedents and authorities, came to the conclusion that “a person keeping a mischievous animal, with knowledge of its propensities, is bound to keep it secure at his peril.” And in 1 Hale’s Pleas of the Crown, 430, Lord Hale states that where one keeps a beast, knowing its nature or habits are such that the natural consequence of his being loose is that he will harm men, the owner “must at his peril keep him up safe from doing hurt; for though he use his diligence to keep him up, if he escape and do harm, the owner is liable to answer damages;” though, as he proceeds to show, he will not be liable criminally without proof of want of care. In these latter authorities the point under consideration was damage to the person, and what was decided was, that where it was known that hurt to the person was the natural consequence of the animal being loose, the owner should be responsible in damages for such hurt, though where it was not known to be so, the owner was not responsible for such damages; but where the damage is, like eating grass or other ordinary ingredients in damage feasant, the natural consequence of the escape, the rule as to keeping in the animal is the same. In Com. Dig. Droit. (M. 2), it is said that “if the owner of 200 acres in a common moor enfeoffs B. of 50 acres, B. ought to enclose at his peril, to prevent damage by his cattle to the other 150 acres. For if his cattle escape thither they may be distrained damage feasant. So the owner of the 150 acres ought to prevent his cattle from doing damage to the 50 acres at his peril.” The authority cited is Dyer, 372 b., where the decision was that the cattle might be distrained; the inference from that decision, that the owner was bound to keep in his cattle at his peril, is, we think, legitimate, and we have the high authority of Comyns for saying that such is the law. In the note to Fitzherbert, Nat. Brevium, 128, which is attributed to Lord Hale, it is said, “If A. and B. have lands adjoining, where there is no enclosure, the one shall have trespass against the other on an escape of their beasts respectively: Dyer, 372, Rastal Ent. 621, 20 Ed. 4, 10; although wild dogs, &c., drive the cattle of the one into the lands of the other.” No case is known to us on which in replevin it has ever been attempted to plead in bar to an avowry for distress damage feasant, that the cattle had escaped without any negligence on the part of the plaintiff, and surely if that could have been a good plea in bar, the facts must often have been such as would have supported it. These authorities, and the absence of any authority to the contrary, justify Williams, J., in saying, as he does in Cox v. Burbidge, supra, that the law is clear that in actions for damage occasioned by animals that have not been kept in by their owners, it is quite immaterial whether the escape is by negligence or not.

As has been already said, there does not appear to be any difference in principle between the extent of the duty cast on him who brings cattle on his land to keep them in, and the extent of the duty imposed on him who brings on his land water, filth, or stenches, or any other thing which will, if it escape, naturally do damage, to prevent their escaping and injuring his neighbor; and the case of Tenant v. Goldwin, supra, is an express authority that the duty is the same, and is, to keep them in at his peril.

As Martin, B., in his judgment below, appears not to have understood that case in the same manner as we do, it is proper to examine it in some detail. It was a motion in arrest of judgment after judgment by default, and therefore all that was well pleaded in the declaration was admitted to be true. The declaration is set out at full length in the report in 6 Mod. p. 311. It alleged that the plaintiff had a cellar which lay contiguous to a messuage of the defendant, “and used (solebat) to be separated and fenced from a privy house of office, parcel of the said messuage of defendant, by a thick and close wall, which belongs to the said messuage of the defendant, and by the defendant of right ought to have been repaired (jure debuit reparari).” Yet he did not repair it, and for want of repair filth flowed into plaintiff’s cellar. The case is reported by Salkeld, who argued it, in 6 Mod., and by Lord Raymond, whose report is the fullest. The objection taken was that there was nothing to show that the defendant was under any obligation to repair the wall, that, it was said, being a charge not of common right, and the allegation that the wall de jure debuit reparari by the defendant being an inference of law which did not arise from the facts alleged. Salkeld argued that this general mode of stating the right was sufficient in a declaration, and also that the duty alleged did of common right result from the facts stated. It is not now material to inquire whether he was or was not right on the pleading point. All three reports concur in saying that Lord Holt, during the argument, intimated an opinion against him on that, but that after consideration the Court gave judgment for him on the second ground. In the report of 6 Mod. 314, it is stated: “And at another day per totam curiam. The declaration is good; for there is a sufficient cause of action appearing in it; but not upon the word ‘solebat.’ If the defendant has a house of office enclosed with a wall which is his, he is of common right bound to use it so as not to annoy another.... The reason here is, that one must use his own so as thereby not to hurt another, and as of common right one is bound to keep his cattle from trespassing on his neighbor, so he is bound to use anything that is his so as not to hurt another by such use.... Suppose one sells a piece of pasture lying open to another piece of pasture which the vendor has, the vendee is bound to keep his cattle from running into the vendor’s piece; so of dung or anything else.” There is here an evident allusion to the same case in Dyer, see ante, p. 334, as is referred to in Com. Dig. Droit. (M. 2). Lord Raymond in his report, 2 Ld. Raym. at p. 1092, says: “The last day of term, Holt, C. J., delivered the opinion of the Court that the declaration was sufficient. He said that upon the face of this declaration there appeared a sufficient cause of action to entitle the plaintiff to have his judgment; that they did not go upon the solebat, or the jure debuit reparari, as if it were enough to say that the plaintiff had a house and the defendant had a wall, and he ought to repair the wall; but if the defendant has a house of office, and the wall which separates the house of office from the plaintiff’s house is all the defendant’s, he is of common right bound to repair it.... The reason of this case is upon this account, that every one must so use his own as not to do damage to another; and as every man is bound so to look to his cattle as to keep them out of his neighbor’s ground, that so he may receive no damage; so he must keep in the filth of his house of office that it may not flow in upon and damnify his neighbor.... So if a man has two pieces of pasture which lie open to one another, and sells one piece, the vendee must keep in his cattle so as they shall not trespass upon the vendor. So a man shall not lay his dung so high as to damage his neighbor, and the reason of these cases is because every man must so use his own as not to damnify another.” Salkeld, who had been counsel in the case, reports the judgment much more concisely (1 Salk. 361), but to the same effect; he says: “The reason he gave for his judgment was because it was the defendant’s wall and the defendant’s filth, and he was bound of common right to keep his wall so as his filth might not damnify his neighbor, and that it was a trespass on his neighbor, as if his beasts should escape, or one should make a great heap on the border of his ground, and it should tumble and roll down upon his neighbor’s, ... he must repair the wall of his house of office, for he whose dirt it is must keep it that it may not trespass.” It is worth noticing how completely the reason of Lord Holt corresponds with that of Brian, C. J., in the cases already cited in 20 Ed. 4. Martin, B., in the Court below says that he thinks this was a case without difficulty, because the defendant had, by letting judgment go by default, admitted his liability to repair the wall, and that he cannot see how it is an authority for any case in which no such liability is admitted. But a perusal of the report will show that it was because Lord Holt and his colleagues thought (no matter for this purpose whether rightly or wrongly) that the liability was not admitted, that they took so much trouble to consider what liability the law would raise from the admitted facts, and it does therefore seem to us to be a very weighty authority in support of the position that he who brings and keeps anything, no matter whether beasts, or filth, or clean water, or a heap of earth or dung on his premises, must at his peril prevent it from getting on his neighbor’s, or make good all the damage which is the natural consequence of its doing so. No case has been found in which the question as to the liability for noxious vapors escaping from a man’s works by inevitable accident has been discussed, but the following case will illustrate it. Some years ago several actions were brought against the occupiers of some alkali works at Liverpool for the damage alleged to be caused by the chlorine fumes of their works. The defendants proved that they at great expense erected contrivances by which the fumes of chlorine were condensed and sold as muriatic acid, and they called a great body of scientific evidence to prove that this apparatus was so perfect that no fumes possibly could escape from the defendants’ chimneys. On this evidence it was pressed upon the jury that the plaintiff’s damage must have been due to some of the numerous other chimneys in the neighborhood; the jury, however, being satisfied that the mischief was occasioned by chlorine, drew the conclusion that it had escaped from the defendants’ works somehow, and in each case found for the plaintiff. No attempt was made to disturb these verdicts on the ground that the defendants had taken every precaution which prudence or skill could suggest to keep those fumes in, and that they could not be responsible unless negligence were shown; yet, if the law be as laid down by the majority of the Court of Exchequer, it would have been a very obvious defence. If it had been raised the answer would probably have been that the uniform course of pleading in actions on such nuisances is to say that the defendant caused the noisome vapors to arise on his premises, and suffered them to come on the plaintiff’s, without stating that there was any want of care or skill in the defendant, and that the case of Tenant v. Goldwin, supra, showed that this was founded on the general rule of law, that he whose stuff it is must keep it that it may not trespass. There is no difference in this respect between chlorine and water; both will, if they escape, do damage, the one by scorching and the other by drowning, and he who brings them there must at his peril see that they do not escape and do that mischief. What is said by Gibbs, C. J., in Sutton v. Clarke, 6 Taunt. 44, though not necessary for the decision of the case, shows that that very learned judge took the same view of the law that was taken by Lord Holt. But it was further said by Martin, B., that when damage is done to personal property, or even to the person, by collision, either upon land or at sea, there must be negligence in the party doing the damage to render him legally responsible; and this is no doubt true, and as was pointed out by Mr. Mellish during his argument before us, this is not confined to cases of collision, for there are many cases in which proof of negligence is essential, as, for instance, where an unruly horse gets on the footpath of a public street and kills a passenger, Hammack v. White, 11 C. B. N. S. 588; 31 L. J. (C. P.) 129; or where a person in a dock is struck by the falling of a bale of cotton which the defendant’s servants are lowering: Scott v. London Dock Company, 3 H. & C. 596; 35 L. J. (Ex.) 17, 220; and many other similar cases may be found. But we think these cases distinguishable from the present. Traffic on the highways, whether by land or sea, cannot be conducted without exposing those whose persons or property are near it to some inevitable risk; and that being so, those who go on the highway, or have their property adjacent to it, may well be held to do so subject to their taking upon themselves the risk of injury from that inevitable danger; and persons who by the license of the owner pass near to warehouses where goods are being raised or lowered, certainly do so subject to the inevitable risk of accident. In neither case, therefore, can they recover without proof of want of care or skill occasioning the accident; and it is believed that all the cases in which inevitable accident has been held an excuse for what prima facie was a trespass, can be explained on the same principle, viz., that the circumstances were such as to show that the plaintiff had taken that risk upon himself. But there is no ground for saying that the plaintiff here took upon himself any risk arising from the uses to which the defendants should choose to apply their land. He neither knew what these might be, nor could he in any way control the defendants, or hinder their building what reservoirs they liked, and storing up in them what water they pleased, so long as the defendants succeeded in preventing the water which they there brought from interfering with the plaintiff’s property.

The view which we take of the first point renders it unnecessary to consider whether the defendants would or would not be responsible for the want of care and skill in the persons employed by them, under the circumstances stated in the case [pp. 268–269].