148. The rule inRylands v Fletcher.

The rule in Rylands v Fletcher1 is closely related to the law of nuisance2. By this rule a person3 who, for his own purposes4, brings onto his land and collects and keeps there anything likely to do mischief5 if it escapes6 must keep it in at his peril and, if he fails to do so, is prima facie liable for the damage7 which is the natural consequence of its escape8. Liability under the rule is strict, and it is no defence that the thing escaped without the defendant's wilful act, default or neglect9. It is, however, necessary that the