3. THE CENTRAL NERVOUS SYSTEM OF RODKN'IS. 



(Preliminary Paper ) 

 [Read l)y abstract before the Denison Scientific Association, April 5th, i8,/d-J 



C. L. Herrick and W. G. Tk;ht. 



Tho following notes upon the central nervous system of Arctomys 

 are intended simply as an introduction to the more detailed work which 

 it is hoped to devote to the nervous anatomy of the rodents. While 

 much has already been done in the examination of other types and 

 some effort has been made to homologize the structures described with 

 those of other orders of mammals, only a few disconnected references 

 to such results of our work can be well introduced. The publication 

 of an incomplete installment of the paper seems advisable, because of 

 the large number of figures which will be necessary to fully carry out 

 the undertaking. These drawings being faithful photographic copies 

 of sketches made by the aid of the camera lucida, are relied uj)on to 

 give our notes a certain value even in their incomplete and imperfect 

 state. 



The several paragraphs having been written'by different hands ami 

 often without opportunity for consultation, it is obvious that disj)anty 

 in style and diversity in treatment may be exi)ected. The responsibil- 

 ity is, therefore, a mixed one, and it will not be |)ossible or necessary 

 to unravel it entirely; the drawings, however, are accredited to the 

 authors respectively, and from the references to these the source of 

 most of the statements may be gathered. 



In the present conflicting condition of neurological literature the 

 smallest contribution of exact data upon the minute structure of the 

 brain should be welcome, and the most hopeful field for the solution 



