52 Life and Matter [chap. m. 



"Thirty years afterwards, in a second edition, 

 Wundt emancipated himself from the fundamental 

 errors of the first, and says that he c learned many 

 years ago to consider the work a sin of his 

 youth ' ; it c weighed on him as a kind of 

 crime, from which he longed to free himself 

 as soon as possible.' In the first, psychology 

 is treated as a physical science, on the same laws 

 as the whole of physiology, of which it is only a 

 part ; thirty years afterwards he finds psychology 

 to be a spiritual science, with principles and 

 objects entirely different from those of physical 

 science. 



" I myself," says Haeckel, " naturally consider 

 the c youthful sin ' of the young physiologist 

 Wundt to be a correct knowledge of nature, and 

 energetically defend it against the antagonistic view 

 of the old philosopher Wundt. This entire 

 change of philosophical principles, which we find 

 in Wundt, as we found it in Kant, Virchow, du 

 Bois-Reymond, Carl Ernst Baer, and others, is 

 very interesting" (p. 36). 



So it is : very interesting ! 



Professor Haeckel is so imbued with 

 biological science that he loses his sense of 

 proportion ; and his enthusiasm for the 

 work of Darwin leads him to attribute to it 

 an exaggerated scope, and enables him to 

 eliminate the third of the Kantian trilogy : 



