Preface -- Foreword to the first edition -- Foreword to the third edition -- The functions of language in two children of six -- Types and stages in the conversation of children between the ages of four and seven -- Understanding and verbal explanation between children of the same age between the years of six and eight -- Some peculiarities of verbal understanding in the child between the ages of nine and eleven -- The questions of a child of six -- The measure of ego-centric language in verbal communication between the adult and the child and in verbal exchanges between children -- Appendix.