This doctrine was further developed by English courts, and made an immediate impact on the law. Prior to Rylands, English courts had not based their decisions in similar cases on strict liability, and had focused on the intention behind the actions rather than the nature of the actions themselves. In contrast, Rylands imposed strict liability on those found detrimental in such a fashion without having to prove a duty of care or negligence, which brought the law into line with that relating to public reservoirs and marked a significant doctrinal shift. The rule in Rylands has both been distinguished with and regarded as a species of the tort of private nuisance. Unlike ordinary cases of private nuisance, the rule in Rylands requires the escape of a thing that arises from a non-natural use rather than the typical interference emanating from unreasonable use of land. It additionally does not require an act to be continuous, which is typically a requirement for nuisance. Academics have criticised the rule both for the economic damage such a doctrine could cause and for its limited applicability.
