PREFACE. IX 



But the question of the evolution of the human mind, 

 or soul, has been successfully divorced from that of 

 the body. Roman Catholic advanced theologians* 

 whose precise terminology demanded a clear position, 

 admit the latter and deny the former categorically. 

 Other theologians, and many philosophers, have still 

 a vague notion that the evidence for the one does not 

 impair their sentimental objection to the other. Dr. 

 Haeckel's work summarizes the evidence for the 

 evolution of mind in a masterly and profoundly 

 interesting fashion. It seems impossible to follow 

 his broad survey of the psychic world, from protist 

 to man, without bearing away a conviction of the 

 natural origin of every power and content of the 



human soul. 



Translator. 



October, 1900. 



