13 



fibre-tracts, and the drawings are evidently intended to illus- 

 trate this phase of the subject alone. The nerve-cells are 

 described as to distribution and general external morphology, 

 so far as they are trade visible by the method employed. The 

 principal aim of the research is an elucidation of fibre-tracts 

 rather than the investigation of nerve-cells. 



In a later research ('9?), Edinger applied essentially the 

 saire methods to the interbrain of selachians and amphibians, 

 and the results have a scope similar to those just noticed for 

 the forebrain. In the later editions of his text-book (19C9) he 

 has amplified for the comparative portion of the vjork the results 

 of all his own studies, together with those of others, giving us 

 the broadest exposition of modern coniparative neurology yet 

 attempted by any writer. 



To Sauerbeck ('9*) belongs the credit of first publishing 

 results from the application of chrome-silver impregnation to 

 the selachian brain. The paper contains a very brief descrip- 

 tion of those neurones and supporting elements which had been 

 impregnated; by far the greater number of the structures present 

 evidently were not demonstrated at all. The treatment is quite 

 unequal for the several regions, and the figures are drawn on a 

 small scale. While Sauerbeck must not be given credit for the 

 things he neither described nor portrayed, yet a first attempt 

 in this field is certainly to be commended. 



Schaper ('95), in the course of a series of studies on the 

 cerebellum of vertebrates, has taken occasion to apply the 



