APPENDIX 179 



mentioned. But the inadequacy of a system of classification 

 founded solely upon structure and not upon relationships, and 

 especially of one which was complete in all of its essential 

 details long before the appearance of Darwin's epoch-making 

 work, has led Haeckel and other authors to return to the task 

 of thoroughly reforming the system on the new lines. In 1888 

 Berthold Hatschek, who has, since Claus' death, occupied his chair 

 in the University of Vienna, published an outline of a new 

 system based upon the earlier efforts of Haeckel, of which 

 the system in the following pages is a modification. 



