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This work, published posthumously, contains a curious mixture of keen observation and analysis with metaphysical leanings to which René Legendre, in a brief biography of the author, refers as a faith "of which Mignard had great need" owing to failing health. As the title indicates, the main thesis of the work is a protest against the doctrine of mental dissociation and an effort to establish the essential unity of the consciousness or mind. Mignard quotes largely from Bergson, with whom, however, he is not in entire accord, and discusses in some detail the views of Bleuler and Freud. He objects to the use of such terms as the subconscious and the unconscious and maintains that the phenomena of mental disorder can all be explained by what he calls "subduction mentale." The essence of the mental unity is its power of self direction and control, which Mignard designates by the term