IT is not the intention of this introduction to psy-chology to discuss the scientific or philosophical conceptions of psychology, or even to make a sur-vey of the investigations and their results. What this little book attempts is rather to introduce the reader to the principal thoughts underlying pre-sent-day experimental psychology, leaving out many facts and methods which would be neces-sary for a thorough study of the subject. To omit all mention of experimental methods and their re-sults is ...