390 'Journal of Comparative Neurology a^id Psychology 



Explanation of Plate II. 



Chart i. The upper continuous line represents the brain weight according to body weight, calcu- 

 lated by formula [i]. The separate entries (. males and X females) show the individual observations 

 so far as they can be entered without confusion. The lower continuous line represents the spinal cord 

 weight according to body weight, calculated by formula [3]. The same scale is used for the two curves. 



Chart 2. The continuous line represents the spinal cord weight according to body weight. The 

 separate entries (. males and X females) show the individual observations so far as they can be entered 

 without confusion. The scale of the ordinates is twice that used in chart I. 



