38 man: 



foUo-w any other than the ordinary line of biological 

 argument. " But it is not upon structural similarity 

 or difference alone," says the most experienced of 

 living naturalists,* that the relations between man 

 and animals have to be considered. The psycholo- 

 gical history of animals shows that as man is related 

 to animals by the plan of his structure, so are these 

 related to him by the character of those very faculties 

 which are so transcendant in man as to point at first 

 to the necessity of disclaiming for him completely 

 any relationship with the animal kingdom. Yet the 

 natural history of animals is by no means completed 

 after the somatic side of their nature has been 

 thoroughly investigated ; for they too have a psycho- 

 logical individuality which, though less studied, is 

 nevertheless the connecting link between them and 

 man. I cannot therefore agree with those authors 

 who would disconnect mankind from the animal 

 kingdom, and establish a distinct kingdom for man 

 alone." 



The slightest glance at the vital world is sufficient 

 to convince that there is a great structural plan to 

 which the whole of its component members are con- 

 formed, and that this plan is applicable alike to the 

 extinct forms revealed by geology and to those still 

 existing. One phase of this plan belongs to the globu- 



* Essay on Classification. By Professor Agassiz, London, 1859. 



