Hakdesty, Mcditlla Spinalis of tJic Elepliant. 179 



the area of substantia grisea is greater than that of the section 

 of the cell-body. 



In the elephant the area of the substantia grisea is 9,000 

 times that of the cell-body, while in the bat it is only 900 times 

 as great, the ratio decreasing through the series with tolerable 



regularity. 



The greater amount of substantia grisea contains not only 

 the larger cell-bodies, but also the greater number of cell-bodies. 

 Therefore the ratios between the areas of the section of the 

 two do not decrease as the areas of the sections of the cell bodies 

 do, and therefore decreasing rather than constant ratios result. 



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