37 8 LIST OF WORKS REFERRED TO IN TEXT. 
46. Wilhelm Wundt, Vorlesungen tber die Menschen- und 
Thierseele. Leipzig, 1863. 
(Wilhelm Wundt, Lectures on the Human and Animal Soul, 
Leipzig, 1863.) 
47. Fritz Ratzel, Sem und Werden der organischen Welt, 
Eine populire Schopfungsgeschichte. Leipzig, 1869. 
(Fritz Ratzel, Nature and Origin of the Organic World. 
A Popular History of Creation. Leipzig, 1869.) 
48. Charles Darwin, The Descent of Man, and Selection in 
Relation to Sex. 2 Vols. London, 1871. 
