Mr. Mégroz's object in this book is to present the main aspects of the study of dreams by summarizing the history and theories of the subject, supported by examples of dreams new and old. It is a survey of dreams rather than an attempt to solve the problems they present, and where the author wishes to press a view of his own he does it by force of multiple example rather than by philosophic argument. The result is a rich collection of dreams of all periods and all stages of culture, savage and civilized, ancient and modern, yet, as Mr. Mégroz points out, there is in spite of their varied sources a significant continuity of certain ideas running