Hardesty, Medulla Spinalis of the Elephant. 



143 



10). The columnae anteriores and posteriores become more 

 sagittally placed in the thoracic segments because of the de- 

 crease in the amount of substantia alba in these funiculi, and 



TABLE II. 



Substantia grisea. 

 Columna anterior: 



(1) Greatest thickness 



(2) Depth 



Columna posterior: 

 (3 ) Thickness 



(4) Depth 

 (1^) Total width 

 Substantia alba. 

 Funiculi anteriores: 



(6) Width 



(7) Depth 

 Funiculi lateraies: 



(8) Width 

 Funiculi posteriores: 



(9) Width in neck 



(10) Width at summit 



(11) Depth 



(12) Width, LissAUER's 

 Zone 





5-3 

 4.0 



2.8 



5-3 

 14.0 



2-3 

 7.0 



S-5 



3-3 

 8.0 



8.0 



1-5 



Table II. Giving the dimensions of the parts indicated as found in trans- 

 verse sections from different segments of the medulla spinalis of the elephant. 

 The segments are noted in the headings of the columns. The measurements 

 are recorded in millimeters. The numbers enclosed with the different entries 

 correspond to like numbers in text-figure I, and thus indicate the locality and 

 direction of the dimension recorded. Measurements recorded in heavier type 

 are those made from the author's specimen. All others are taken from KoPSCH's 

 table of similar measurements (loc. cit.). Thoracic XIX is included from 

 Kopsch's table as the segment possessing the largest dimensions of any in the 

 intumescentia lumbalis. 



the columna anterior becomes thinner chiefly because of the 

 absence of the columna lateralis (lateral horn). Kopsch's 

 measurements show that, in the intumescentia lumbalis, it be- 

 comes almost as thick as in cervical IV, though it still maintains 

 a more sagittal position. The slight increase in the width of 

 the antejior and posterior funiculi in the lumbar segments is in- 

 terpreted as due to the greater abundance of fasciculi proprii 



