chapter  3
Pages 101

The nursling’s psychic activity is at first only simple assimilation of the external environment to the functioning of the organs. Through the medium of assimilatory schemata, at first fixed, then mobile, the child proceeds from this elementary assimilation to putting means and ends into relationships such that the assim­ ilation of things to personal activity and the accommodation of schemata to the external environment find an increasingly stable balance. The undifferentiated and chaotic assimilation and ac­ commodation which characterize the first months of life are su­ perseded by assimilation and accommodation simultaneously dis­ sociated and complementary.