3- THE CENTRAL NERVOUS SYSTEM OF RODENTS. 
(Preliminary Paper ) 
[Read by abstract before the Denison Scientific Association, April 5th, 1890’] 
C. L. Herrick and W. G. Tight. 
Tho following notes upon the central nervous system of Ai'-cioinys 
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 upon to 
give our notes a certain value even in their incomplete and imperfect 
state. 
The several paragraphs having been writtenTy different hands and 
often without opportunity for consultation, it is obvious that disparity 
in style and diversity in treatment may be expected. The responsibil- 
ity is, therefore, a mixed one, and it will not be possible 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 
