130 Journal of Comparative Neurology. 



extent therefore comprised a portion of the nucleus funiculi 

 gracilis and funiculi cuneati, a portion of the decussatio lemnis- 

 corum, the decussatio pyramidum, the segments of the eight 

 Nn. cervicales with the intumescentia cervicalis, and the seg- 

 ments of the seven succeeding Nn. thoracales. Since the 

 elephant possesses nineteen thoracic segments none of the 

 intumescentia lumbalis was included. 



The material, being fixed and preserved in formalin, was 

 perfectly suited for the application of the iron-haematoxylin 

 method for the demonstration of the medullated axones and the 

 cell bodies of the neurones.' Celloidin sections stained by this 

 method were largely used for the following studies. Those 

 chosen for the illustrations were photographed by transmitted 

 light by means of the large Zeiss projection apparatus. Out- 

 line tracings of the photographs were made in certain cases for 

 companion illustrations to the photographs in order to facilitate 

 reference to the parts. In the tracings the positions of struc- 

 tures are indicated, while the actual appearances of the structures 

 are shown in the photographs. Further technique employed 

 •will be better given under the discussions involving it. 



Macroscopic Studies. 



A review of the literature has so far disclosed but three 

 papers touching at all upon the medulla spinalis of the elephant. 

 None of these deals with its microscopic anatomy and but one 

 goes with any detail into its macroscopic features. An exam- 

 ination of the literature reveals a greater interest in the repro- 

 ductive organs of the elephant than in its nervous system. 

 Most of the observations recorded have been within the realm 

 of gross anatomy rather than microscopic. With the hope that 

 it will be of some convenience to others who should undertake 

 studies dealing with the elephant, the author, in addition to the 

 papers cited as touching upon his own observations, has ap- 

 pended a list of other papers found touching upon the anatomy 

 of the elephant. 



' Hardesty, Neurological Techniijue. Method \. 7'/i^ Universtty of Chi- 

 tago Press, 1902. 



