Xll CONTENTS. 



Newer and Higher Varieties -of Man. page 



This Progression in Obvious Operation. 

 Effect of Geological Changes. 

 Differences among Men lessened but not obli- 

 terated by Higher Developments. 

 Our Eighth Proposition. 



Conclusion . . . -185 



Summary of the Argument. ' 

 Its Practical and Scientific Bearings. 

 Opposition Unavailing. 

 Prospect of its Adoption. 



Index . .... .195 



