Reconciliation of common-law absolute liabilities for the getting out of hand of things likely to escape and do damage with the doctrine of no liability without fault has been sought by means of a fiction of negligence, by pronouncing them disappearing historical anomalies, by an economic interpretation that regards them as results of class interest distorting the law, and by a theory of _res ipsa loquitur_. Blackstone resorted to the first of these. "A man is answerable," he said, "for not only his own trespass but for that of his cattle also; for if by his negligent keeping they stray upon the land of another ... this is a trespass for which the owner must answer in damages." But note that the negligence here is a dogmatic fiction. No proof of negligence is required of the plaintiff, nor may the defendant show that there was in fact no negligence. The negligence is established by the liability, not the liability by the negligence. In the last century it was usual to refer to absolute liability for trespassing animals, for injuries by wild animals and for injuries by domestic animals, known to be vicious, as disappearing rudiments of the old liability to make composition. The common American doctrine as to cattle running at large upon uncultivated lands seemed to confirm this. Yet one need but look beneath the surface to see that the English rule was rejected for a time in America, not because it was in conflict with a fundamental principle of no liability without fault, but because it presupposed a settled community, where it was contrary to the general security to turn cattle out to graze, whereas in pioneer American communities of the past vacant lands which were owned and those which were not owned could not be distinguished and the grazing resources of the community were often its most important resources. The common-law rule, without regard to its basis, was for a time inapplicable to local conditions. It is significant that as the conditions that made the rule inapplicable have come to an end the rule has generally re-established itself. In England it is in full vigor so that the owner of trespassing animals is held for disease communicated by them although he had no knowledge or reason to suppose they were diseased. A rule that can re-establish itself and extend its scope in this way is not moribund. It must have behind it some basis in the securing of social interests. Nor have the attempts of some American courts to narrow common-law liability for injuries by known vicious animals to cases of negligent keeping made much headway. The weight of American authority remains with the common-law rule and in England the Court of Appeal has carried the rule out to the extent of holding the owner notwithstanding the animal was turned loose by the wrongful act of an intermeddling third person. Nor have the predictions that the doctrine of _Rylands_ v. _Fletcher_ would disappear from the law through the courts' smothering it with