The present book is a collection of originally independent ar-ticles which were written at different times and for quite diffe-rent occasions. Hence, the reader will find some of the funda-mental ideas recurring throughout the book. The selection has been made in order to give a picture of the fields thus far stu-died, th& psychology of the person and of the environment, and at the same time to indicate their connections with the various applied fields, especially child psychology, pedagogy, psycho-pathology, characterology, and social psychology.