IP 



sections, exhibitirif; very little detail. His most grievous 

 mistake lay in his refusal to apply the brilliant generalif^a- 

 tion on the pallium which Rabl-Biickhard ('8?.) had published 

 shortly before, rejecting it as an impossible explanation of 

 the selachian forebrain. 



We now turn to the work of an investigator whose privelege 

 it has been to lay many of the stones for the foundation of 

 comparative neurology. Dr.^dinger has demonstrated that it is 

 possible to carry on research in the right way in spite of the 

 exhausting cares of a physician's life. His earlier work ('38) 

 includes the consideration of both the eir.bryonic and adult 

 selachian forebrain as a part of a systematic study of the 

 forebrain of the several groups of vertebrates. By this time 

 there had been given to neurological workers two of the most 

 important methods of investigation yet imagined, the chronie- 

 silver impregnation of Golgi, and the myelin stain of Weigert. 

 The former has led, ultinately, to the modern conception of the 

 neurone as a structural and physiological unit; while the latter, 

 including here the various modifications of the essential prin- 

 ciple, has grounded our knowledge of the course of nerve-f ib,res 

 in the cerebrospinal axis. In the research under consideration, 

 ('S8), Edinger was the first to apply the staining method of 

 Weigert to the brain of the selachian. Using a counter-stain 

 to define the nerve-cells more clearly, his results were charac- 

 teri7ed by a precision not known to the earlier workers. The 

 chief part of the text is occupied by a description of the 



