143 



palLiaii at all, a very suggestive fact in connection with the 

 interpretation placei in the present paper upon the pallium of 

 Mustelus. An extension of the scope of experimental work on the 

 fishes will certainly prove fruitful for comparative neurology 

 in so many ways that the writer feels impellei to bespeak a 

 larger place for this kini of work in oar investigations. 



Since the promulgation of the neurone concept by i^aldeyer 

 in 1391, no work has ieraanied more critical attention than that 

 on the ultimate fibrillar structure of the nervous systen, 

 studies with which tne names of Apathy, Eethe, and Nissl will 

 ever be connected. An investigation of neuro-f ibrils obviously 

 lies beyond the bounds set for the present research, and obser- 

 vations concerning them in Mustelus must await another opportu- 

 nity for expression. In the meantime, I would join with the 

 protest made by A.Veyer ('99), Parker (1900), and Verworn (1900) 

 against the tendency to elevate the results of specific methods 

 into an exclusive dogma. Although spoken from a different 

 vantage-point, the words of Golgi (1900) may well be quoted 

 here: "The knowledge which we possess, either anatomical or 

 physiological, is not yet such as to permit us to interpret 

 with certainty the greater number of the facts discovered, 

 much less to attempt doctrinal constructions of a high order 

 on the functional mechanism of the nervous elements". 



