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The greater part of this volume is devoted to a subject in which Dumas is particularly interested, the expression of emotions. He reviews the literature on this problem and the various methods of attacking it. Among the latter he finds the study of psychotic patients most profitable and illustrates the various emotional expressions by numerous photographs of patients showing different types of mental disorder.
Dumas is also responsible for another section of the volume, that on mimicry, with a chapter on vocal mimicry. The literature on this subject is much less extensive than that on the expression of emotion, but the subject is of great interest, particularly in connection with any study of language and its disorders.
Ombredane contributes two ably written sections, a comparatively brief one on equilibrium and orientation and a longer one on language. The greater part of the latter is concerned with aphasia, apraxia and agnosia.