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The work of Piaget has an originality of conceptualization and a uniqueness of methodology which assure the author a special and enviable position in the history of the development of psychology as a science.
This volume is concerned with the stages of development of the concepts of the 'real categories'—object, space, causality, and time—during the first two years of the infant's life. This has a special significance for current psychoanalytic preoccupation with the development of the adult ego. Escalona, in the jacket blurb, describes Piaget's present work as 'a study in genetic epistemology'. It is