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It¡¡cannot¡¡be¡¡inferred£»¡¡from¡¡the¡¡mere¡¡circumstance¡¡that¡¡certain¡¡conduct¡¡is¡¡made¡¡actionable£»¡¡that¡¡therefore¡¡the¡¡law¡¡regards¡¡it¡¡as¡¡wrong£»¡¡or¡¡seeks¡¡to¡¡prevent¡¡it¡£¡¡Under¡¡our¡¡mill¡¡acts¡¡a¡¡man¡¡has¡¡to¡¡pay¡¡for¡¡flowing¡¡his¡¡neighbor's¡¡lands£»¡¡in¡¡the¡¡same¡¡way¡¡that¡¡he¡¡has¡¡to¡¡pay¡¡in¡¡trover¡¡for¡¡converting¡¡his¡¡neighbor's¡¡goods¡£¡¡Yet¡¡the¡¡law¡¡approves¡¡and¡¡encourages¡¡the¡¡flowing¡¡of¡¡lands¡¡for¡¡the¡¡erection¡¡of¡¡mills¡£
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It¡¡is¡¡doubtful£»¡¡however£»¡¡whether¡¡the¡¡ruling¡¡of¡¡Chief¡¡Justice¡¡Rolle¡¡would¡¡now¡¡be¡¡followed¡£¡¡The¡¡squib¡¡case£»¡¡Scott¡¡v¡£¡¡Shepherd£»¡¡and¡¡the¡¡language¡¡of¡¡some¡¡text¡¡¡books£»¡¡are¡¡more¡¡or¡¡less¡¡opposed¡¡to¡¡it¡£¡¡/2/¡¡If¡¡the¡¡latter¡¡view¡¡is¡¡law£»¡¡then¡¡an¡¡act¡¡must¡¡in¡¡general¡¡not¡¡only¡¡be¡¡dangerous£»¡¡but¡¡one¡¡which¡¡would¡¡be¡¡blameworthy¡¡on¡¡the¡¡part¡¡of¡¡the¡¡average¡¡man£»¡¡in¡¡order¡¡to¡¡make¡¡the¡¡actor¡¡liable¡£¡¡But£»¡¡aside¡¡from¡¡such¡¡exceptional¡¡cases¡¡as¡¡Gilbert¡¡v¡£¡¡Stone£»¡¡the¡¡two¡¡tests¡¡agree£»¡¡and¡¡the¡¡difference¡¡need¡¡not¡¡be¡¡considered¡¡in¡¡what¡¡follows¡£
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£§152£§¡¡The¡¡same¡¡transition¡¡is¡¡noticeable¡¡with¡¡regard¡¡to¡¡the¡¡teachings¡¡of¡¡experience¡£¡¡There¡¡are¡¡many¡¡cases£»¡¡no¡¡doubt£»¡¡in¡¡which¡¡the¡¡court¡¡would¡¡lean¡¡for¡¡aid¡¡upon¡¡a¡¡jury£»¡¡but¡¡there¡¡are¡¡also¡¡many¡¡in¡¡which¡¡the¡¡teaching¡¡has¡¡been¡¡formulated¡¡in¡¡specific¡¡rules¡£¡¡These¡¡rules¡¡will¡¡be¡¡found¡¡to¡¡vary¡¡considerably¡¡with¡¡regard¡¡to¡¡the¡¡number¡¡of¡¡concomitant¡¡circumstances¡¡necessary¡¡to¡¡throw¡¡the¡¡peril¡¡of¡¡conduct¡¡otherwise¡¡indifferent¡¡on¡¡the¡¡actor¡£¡¡As¡¡the¡¡circumstances¡¡become¡¡more¡¡numerous¡¡and¡¡complex£»¡¡the¡¡tendency¡¡to¡¡cut¡¡the¡¡knot¡¡with¡¡the¡¡jury¡¡becomes¡¡greater¡£¡¡It¡¡will¡¡be¡¡useful¡¡to¡¡follow¡¡a¡¡line¡¡of¡¡cases¡¡up¡¡from¡¡the¡¡simple¡¡to¡¡the¡¡more¡¡complicated£»¡¡by¡¡way¡¡of¡¡illustration¡£¡¡The¡¡difficulty¡¡of¡¡distinguishing¡¡rules¡¡based¡¡on¡¡other¡¡grounds¡¡of¡¡policy¡¡from¡¡those¡¡which¡¡have¡¡been¡¡worked¡¡out¡¡in¡¡the¡¡field¡¡of¡¡negligence£»¡¡will¡¡be¡¡particularly¡¡noticed¡£
In¡¡all¡¡these¡¡cases¡¡it¡¡will¡¡be¡¡found¡¡that¡¡there¡¡has¡¡been¡¡a¡¡voluntary¡¡act¡¡on¡¡the¡¡part¡¡of¡¡the¡¡person¡¡to¡¡be¡¡charged¡£¡¡The¡¡reason¡¡for¡¡this¡¡requirement¡¡was¡¡shown¡¡in¡¡the¡¡foregoing¡¡Lecture¡£¡¡Unnecessary¡¡though¡¡it¡¡is¡¡for¡¡the¡¡defendant¡¡to¡¡have¡¡intended¡¡or¡¡foreseen¡¡the¡¡evil¡¡which¡¡he¡¡has¡¡caused£»¡¡it¡¡is¡¡necessary¡¡that¡¡he¡¡should¡¡have¡¡chosen¡¡the¡¡conduct¡¡which¡¡led¡¡to¡¡it¡£¡¡But¡¡it¡¡has¡¡also¡¡been¡¡shown¡¡that¡¡a¡¡voluntary¡¡act¡¡is¡¡not¡¡enough£»¡¡and¡¡that¡¡even¡¡a¡¡co¡ordinated¡¡series¡¡of¡¡acts¡¡or¡¡conduct¡¡is¡¡often¡¡not¡¡enough¡¡by¡¡itself¡£¡¡But¡¡the¡¡co¡ordination¡¡of¡¡a¡¡series¡¡of¡¡acts¡¡shows¡¡a¡¡further¡¡intent¡¡than¡¡is¡¡necessarily¡¡manifested¡¡by¡¡any¡¡single¡¡act£»¡¡and¡¡sometimes¡¡proves¡¡with¡¡almost¡¡equal¡¡certainty¡¡the¡¡knowledge¡¡of¡¡one¡¡or¡¡more¡¡concomitant¡¡circumstances¡£¡¡And¡¡there¡¡are¡¡cases¡¡where¡¡conduct¡¡with¡¡only¡¡the¡¡intent¡¡and¡¡knowledge¡¡thus¡¡necessarily¡¡implied¡¡is¡¡sufficient¡¡to¡¡throw¡¡the¡¡risk¡¡of¡¡it¡¡on¡¡the¡¡actor¡£
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