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The kind reception these lectures on hysteria have met with encourages us to publish a second edition of this work. It does not seem to us very useful to modify it profoundly, for the interest of a scientific work resides almost always in the date at which it was drawn up, and one should not confusedly mix the ideas of one period with those of another. I only wish to Show in a short preface that certain notions set forth in' these lectures of 1906 have spread very much since that date and have played a great part in the interpretation of hysteria. I should also like to show in what direction I have been led myself, in my other works published since that time, to develop certain of my preceding interpretations.
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