MAIN PATHWAYS AND TENDENCIES 123 



ried out on a higher plane than that of previous 

 years, investigations of the architecture of the. 

 nervous system in all its aspects is one of the obvious 

 recent tendencies of zoology. 



Cooperation in neurological research is a promising 

 sign, made by the association of Neurological Insti- 

 tutes in a tacitly understood program of investiga- 

 tion. Some of the Institutes thus cooperating are 

 those of Ludwig Edinger at Frankfort on the Main, 

 of Ariens Kappers of Holland and of the Wistar 

 Institute of Philadelphia. In the United States the 

 Wistar Institute of Anatomy and Biology is especially 

 devoted to researches in Neurology under the leader- 

 ship of Professor H. H. Donaldson. 



Adjuncts. Various adjuncts such as museums, 

 zoological gardens, special collections, etc., have 

 been helpful to the work of zoologists. These have 

 been of service in the dissemination of knowledge of 

 animals among the masses, but, most of all, they have 

 supplied facilities for the researches of specialists. 

 Among the institutions of this type in the United 

 States may be mentioned the Agassiz Museum of 

 Comparative Zoology at Harvard University, the 

 collections at Yale University, the American Mu- 

 seum of Natural History of New York City, the 



