Or imagine that it was usual for a man to have two characters, in this way: His shape, size, and characteristics of behaviour sometimes changed unaccountably. It is the usual thing that a man has two such states, and he lapses suddenly from one into the other. It is very likely that in such a
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case we should be inclined to christen every man with two names, and perhaps to talk of the pair of persons in his body. Now were Dr.Jekyll and Mr.Hyde two persons or were they the same person who merely changed? We can say whichever we like. We are not forced to talk of a double personality.