OBSERVATIONS- ON THE MEDULLA SPINALIS OF 

 THE ELEPHANT WITH SOME COMPARATIVE 

 STUDIES OF THE INTUMESCENTIA CERVICALIS 

 AND THE NEURONES OF THE COLUMNA AN- 

 TERIOR. 



By Irving Hardesty, 



Instructor in The University of California . 



{From the Neurological Laboratory of the University of Chicago and The Hearst 

 Laboratory of the University of California.) 



With Plates IX — XIII ;ind one figure in the text. 



Contents and Summary. 



I. 



II. 



Introduction. 



History of the material. 



Fixation and preservation. 



Preparation and photography. 

 Macroscopic Studies. 



Review of hterature. 



Appearances in situ. 



Shape and dimensions of ^ecimen. 



Segments and radices. 



Appearances in section. 



Variations in sections from different segments, Table I. 



Measurements of different components of sections, 

 Table II. 



III. Microscopic Studies. 



1. The fasciculus gracilis is well defined in the cervical 

 segments with seemingly a lateral limb extending over the outer 

 periphery of the fasciculus cuneatus. 



2. The medullated axones composing the fasciculus gra- 

 cilis are_ more compactly bundled and possess a less average 

 caliber than those of the fasciculus cuneatus. 



