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Published online by Cambridge University Press: 19 February 2018
The important part played by heredity in the causation of insanity has long been recognised. Much has been written on the subject and investigations have frequently been made to show its influence. Owing to the complexity, variability and general indefinite character of insanity these inquiries have been mainly statistical. It is recognised that no form of insanity is of such definite and simple nature as to be readily available for study in its hereditary aspect by Mendelian methods. As has been repeatedly stated by various writers on the subject, it is not insanity, recognisable as such, that is inherited, but an abnormal nervous system liable to the development of the various conditions included in the term “insanity.”
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