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 shewing 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.
Notwithstanding the many accolades which have been, and continue to be, lavished on Blackburn J.'s judgment [1] , that brief exposition of "the true rule of law" is largely bereft of current authority or validity if it be viewed, as it ordinarily is, as a statement of a comprehensive rule [2] . Indeed, it has been all but obliterated by subsequent judicial explanations and qualifications. Thus, the phrase "for his own purposes" has been largely discarded as a general qualification. While it occasionally re-emerges in general statements of the rule, its current role would seem to be confined to that of a bolster of the requirement of "natural use" [3] in cases involving the use of premises for public or patriotic purposes [4] . The possessive "his" before "lands", apparently used to denote ownership, must be expanded to include the non-owning occupier. Arguably, it should be further expanded to the stage where it would include any person in control. On the other hand, it is arguable that it should be confined to exclude the non-occupying owner. The word "lands", used in conjunction with "escapes", is too narrow. The precise extent to which it should be extended is, however, a matter of complete uncertainty. The conjunctive "and" before "collects" and "keeps" should be read as the disjunctive "or". The phrase "anything likely to do mischief if it escapes" has, in a process commenced by Blackburn J. himself [5] , largely been supplanted by the word "dangerous". The reference to "all the damage which is the natural consequence of its escape" is too wide [6] . The statement that it was "unnecessary to inquire what excuse would be sufficient" has inevitably been overlaid by decisions identifying such excuses. It does, however, serve the continued purpose of highlighting the fact that the rule enunciated by Blackburn J. was, as his Lordship made clear, one of "prima facie" liability.
1. (1866) L.R. 1 Ex., at pp. 279-280.
2. Willes, Blackburn, Keating, Mellor, Montague Smith and Lush JJ.
3. See, e.g., Wigmore, Responsibility for Tortious Acts: Its History, Harvard Law Review, vol. 7 (1894) 315; 383; 441, at p. 454: "the master-mind of Mr. Justice Blackburn"; Newark, The Boundaries of Nuisance, Law Quarterly Review, vol. 65 (1949) 480, at p. 487: "his great judgment"; Salmond and Heuston on the Law of Torts, 20th ed. (1992), p. 314: "always been recognised as one of the masterpieces of the Law Reports."
4. See, e.g., Jones v Festiniog Railway Co. (1868), L.R. 3 Q.B., at p. 736, per Blackburn J.: "the general rule of common law."
5. See below.
6. See, e.g., Read v J. Lyons & Co. Ltd. [1947] AC., at pp. 169-170.
7. Jones v Festiniog Railway Co. (1868), L.R. 3 Q.B., at p. 736: "a thing of a dangerous nature."
8. See below, fn. 55.