• Le Langue et la pensee chez l'enfant. Paris: Delachaux and Niestle, 1923. Published in English as The Language and Thought of the Child. Trans. by Marjorie Worden. New York: Harcourt, Brace, 1926, 3rd revised edition, Humanities 1959, reprinted, 1971.
• Le Jugement et le raisonnement chez l'enfant. Paris: Delachaux & Niestle, 1924, 5th edition, 1963. Published in English as The Judgement and Reasoning in the Child. Trans. by Marjorie Worden. New York: Harcourt, Brace, 1928, published as The Judgment and Reason in the Child. 1929, reprinted, Littlefield, 1976.
• Le Representation du monde chez l'enfant. Paris: Delachaux and Niestle, 1926. Published in English as The Child's Conception of the World. Trans. by Jean Tomlinson and Andrew Tomlinson. New York: Harcourt, Brace, 1929, reprinted, Littlefield, 1976.
• La Causalite physique chez l'enfant. Paris: Delachaux & Niestle, 1927. Published in English as The Child's Conception of Physical Causality Trans. by Marjorie Worden Gabain. New York: Harcourt, Brace, 1930.
• La Naissance de l'intelligence chez l'enfant. Paris: Delachaux and Niestle, 1936, 5th edition, 1966. Published in English as The Origins of Intelligence in Children. Trans. by Margaret Cook. New York: International Universities Press, 1952. Published in English as The Origin of Intelligence in the Child. London: Routledge & Kegan Paul, 1953, Norton, 1963.
• La Formation du symbole chez l'enfant: Imitation jeu et reve, image et rpresentation. Paris: Delachaux and Niestle, 1945, 2nd edition, 1959. Published in English as Play, Dreams, and Imitation in Childhood. Trans. by Gattegno and Hodgson. New York: W. W. Norton & Co., 1951, reprinted, Peter Smith, 1988.
• With Barbel Inhelder. La Psychologie de l'enfant Presses universitaires de France, 1966, 6th edition, 1975. Published in English as The Psychology of the Child. Trans. by Helen Weaver. New York: Basic Books, 1969.
• L'Epistemologie genetique. Presses universitaires de France, 1970. Published in English as The Principles of Genetic Epistemology. Trans. by Wolfe Mays. New York: Basic Books, 1972.
• L'Equilibration des structures cognitives: probleme central du developpement. Presses universitaires de France, 1975. Published in English as The Development of Thought: Equilibration of Cognitive Structures. Trans by Arnold Rosin. New York: Viking, 1977.
journals. Such early success with his study of clams and snails gave young Piaget a firm basis for the continued development of his scientific approach to the study of nature. He sustained his interest in mollusks throughout his life.
In 1918, at the age of 21, Jean Piaget graduated with a doctorate in natural sciences from the University of Neuchatel. That same year he published his first book, Recherche, meaning "the search" or "searching," an autobiographical novel dealing with the conflict between science and religion. In this book Piaget first explored the idea of equilibrium, a concept that he understood as an ideal balance between parts and the whole, both within an individual and within society.
Piaget published his doctoral thesis on the classification of mollusks. During the intense periods of academic exploration and focus throughout his university years, Piaget's physical health suffered. He was forced to take a year off from his studies and retreated to the mountains to recuperate. This rest period in the Swiss Alps became a yearly habit throughout his life, providing him with critical time for reflection and rest. Piaget valued his relationship with the natural world as a necessary ingredient in a balanced life.
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