Chapter 1 The Functions of Language in two Children of Six1With the collaboration of Mlle Germaine Guex and of Mlle Hilda de Meyenburg.; Chapter 2 Types and Stages in the Conversation of Children Between the Ages of Four and Seven.1With the collaboration of Mme Valentine Jean Piaget. We also wish to thank Mlle G.Guex who helped us to collect our materials.; Chapter 3 Understanding and Verbal Explanation Between Children of the Same Age Between the Years of Six and Seven.1With the collaboration of Mme Valentine Jean Piaget.; Chapter 4 Some Peculiarities of Verbal Understanding in the Child between the Ages of Nine and Eleven.1With the collaboration of Mlle Alice Deslex.; Chapter 5 The Questions of a Child of Six1With the collaboration of Mlle.Liliane Veihl.; Chapter 6 The Measure of Ego-Centric Language in Verbal Communication Between the Adult and the Child and in Verbal Exchanges Between Children.1In collaboration with Mme A.Lcuzinger-Schuler.;