INTRODUCTION. 9 



we should be all agreed that in the case of these 

 animals the life is so very thin-spun that any 

 suggestion of abhorrence is on the face of it 

 absurd.* 



* The relfition of consciousness to the elaboration of nerve- 

 centres throughout the animal kingdom is more fully considered 

 in my work on "Mental Evolution in Animals" (Kcgan Paul, 

 Trench & Co. : 1SS3). 



