INTRODUCTION vii 



richer in interest, broader in its activities and 

 its outlook, and sweeter to the taste. 



To this end men and women who have given 

 each a lifetime of study and thought to his or 

 her speciality, will contribute to the Library, 

 and it is safe to promise that each volume will 

 join with its eminently practical information a 

 still more valuable stimulation of thought. 



ERNEST INGERSOLL. 



