THE CENTRAL GUSTATORY PATHS IN THE BRAINS 

 OF BONY FISHES. 



By C. JuDSON Herrick. 



Studies from the Neu7-ological Laboratory of Dt-nison University. No. XVIII^. 

 With Forty Figures in the Text. 



CONTENTS. 



Section I. Introduction. 



Section II. The Perii'Heral Gustatory System in Fishes. 



Section III. The Central Gustatory System of Cyprinoid Fishes. 



1 . Primary Gustatory Centers. 



2. Secondary Gustatory Tracts. 



(i) Descending Secondary Gustatory Tract. 

 (2) Ascending Secondary Gustatory Tract. 



3. Superior Secondary Nucleus and its Connections. 



Section IV. The Central Gustatory System of Siluroid Fishes. 

 Section V. Summary and General Conclusions. 



Table of the Gustatory Paths in Fishes. 



Mammalian Homologies of the Gustatory Centers of Fishes. 



General Morphology of the Gustatory System. 

 Literature Cited. 



Section I. Introduction. 



The conception of the nervous system as a mechanism for 

 putting the organism into correspondence with the external en- 

 vironment and, in higher animals, for coordinating the reacting 

 apparatus itself (internal environment) may be said to give the 

 key to its evolutionary history. These two factors have given 

 direction to the differentiation of the nervous system into so- 

 matic and visceral systems respectively and the further subdi- 

 vision of each of these. 



' This study was awarded the Cartwright Prize for 1905 by the Alumni As- 

 sociation of the College of Physicians and Surgeons, Columbia University, New 

 York. It is published simultaneously in the Journal of Comparative Neurology 

 and Psychology and the Bulletin of the Scientific Laboratories of Denison University, 

 pages 375 to 456 of volume XV of the fournal being severally identical with 

 pages 35 to 116 of volume XIII of the Bulletin. 



