Classicly

This book is the direct result of what, at the time of its occurrence, seemed to be an unimportant incident in the course of my scientific work— the presentation of a pair of dancing mice to the Harvard Psychological Laboratory. My interest in the peculiarities of behavior which the creatures exhibited, as I watched them casually from day to day, soon became experiment-impelling, and almost before I realized it, I was in the midst of an investigation of their senses and intelligence. - Preface by Author.