Jean Piaget (1896-1980) always considered himself a natural scientist, not a psychologist. As a boy he quickly gave up play and pretend to take refuge in "work" -- exploring internal combustion ...

Summaries of Piaget's more recent work may be found in “Introduction à l'Épistémologie Génétique” (Presses Universitaires de France, 1949–50, 3 vols.); and “Logic and Psychology” (Manchester ...