[EXPLANATION OF FRONTISPIECE.]
[CHAPTER II. STATEMENT OF THE SUBJECT.]
[CHAPTER III. THE QUESTION EXAMINED IN THE ABSTRACT.]
[CHAPTER IV. THE QUESTION IN ITS CONNEXION WITH POLITICAL ECONOMY.]
[CHAPTER V. THE QUESTION CONSIDERED IN ITS SOCIAL BEARINGS.]
[CHAPTER VI. THE SUBJECT CONSIDERED IN ITS IMMEDIATE CONNEXION WITH PHYSIOLOGY.]