CORRELATED ANATOMICAL AND PHYSIOLOGICAL 



STUDIES OF THE GROWTH OF THE NERVOUS 



SYSTEM OF AMPHIBIA 



I. THE AFFERENT SYSTEM OF THE TRUNK OF AMBLYSTOMA 



G. E. COGHILL 



Department of Anatomy, University of Kansas 



SIXTY FIGURES 



The investigations upon the basis of which this paper is written 

 have been in progress for several years. My purpose in the work 

 and my general plan of study of the relation between the devel- 

 opment of particular structures of the nervous system and the 

 behavior of the embryo have been stated in several publications. 

 In brief, my effort has been to analyze the function of the re- 

 ceptor system, to determine whether the development of move- 

 ments is in a regular order or haphazard, to discover the exact 

 relation of the nature of the stimulus to reaction, and to study 

 the relation of behavior to the processes of growth and differ- 

 entiation throughout the nervous system. Through such studies 

 it has been expected that new light may be thrown upon the 

 function of particular parts of the nervous system, the causal 

 factors in behavior, elementary processes in the action of the 

 nervous system and possibly upon fundamental problems of 

 growth. That knowledge from this source may prove of inter- 

 est to psychology also, is perhaps not too much to anticipate. 



My earlier results were read, in part, before the American 

 Society of Zoologists and the American Association of Anato- 

 mists in their Chicago meetings of 1907, and published a little 

 later in the Anatomical Record (July, 1908) and in this Journal 

 (June, 1909). These communications described the movements 



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THE JOURNAL OF COMPARATIVE NBUBOLOGY. VOL. 24, NO. 2 



