PREFACE. ix 



Human Race. The ivealtli of the world may le legiti- 

 mately levied upon for that end. 



The classically educated reader may be impatient 

 at times with the pains-taking explanation of the 

 meaning of terms which he will find in my writings ; 

 but I write, equally, for the non-classical ; and I know 

 how necessary and grateful such aids of the under- 

 standing often are to them. 



S. P. A. 



NEW YORK, February, 1870. 



