The author of the book is a remarkable popularizer of psychology. His personal and professional experience has been reflected in the book. It is the result of thorough observations, experiments, thoughts of the author, based on the ideas, works, finds of past and present psychologists and doctors. This book has been written several decades ago, but each teacher, each thinking parent and also each student would find psychological data in the bright, easily perceived form. The issues which are considered in the book are very urgent nowadays.