2 24 Journal of Comparative Nairology and Psychology 



^, Total area of Total area of ,, ^. 



Observer . i ^ j i ^ Katio 



ventral roots dorsal roots 



The lowest ratio appears in Stilling's case, and the rea- 

 son for this diminished value is the large area of the ventral 

 roots in his case. The ratio for the author's case (male), 

 1:2.07, is almost the same as that for Kcir.LiKER's (female) 

 1:2.04. 



In order better to compare the relation between the areas 

 of the two series of roots in the case under investigation, Figs. 4 

 and 6 have been constructed on the basis of data given in Ta- 

 ble V (p. 226). 



100 

 80 

 60 

 40 

 20 



100 

 80 

 60 

 40 

 20 



Fid.IE.Coinparifon of area? of spinal roots (In(5berl) 

 ;__^^» A. Venlral rool? 



'\ \ Area of lar^esf roof -100% 



/ . ' B. Dorfol rod* 



/ ■■. . Area of lortfesf roof-100% 



J I I I I 1 1 1 1 ' '"^ 



Fid. Y. Comparison of numbers of fiber? in .spinal roofs (In^berl) 

 /\ ,'^ \ A. Number in venlral rools /, 



I y. \ lor(^e5f number-IOO°i . /' \ 



I / \ \ B. Number in dorsal rool» / / W i 



' / ~~- a loriSesr number -100% ^._ ,/ \/ \ > 



- J.-/ 



J l_l I 1 I I L. 



innr KY n mnni nrnni nninnrx xnxni u mEnnnHm 

 CERVICAL THORACIC LUMBAR SACKAl 



Fig. ^. Curves comparing the area of the ventral and dorsal roots of the 

 left spinal nerves, the values in each curve being entered in percentages of the 

 greatest area, which is taken as lOOf^J;. One unit on the axis of the ordinates 

 equals i^i. 



F'S- 5- Curves for comparison of the numbers of medullated nerve fibers 

 in the ventral and the dorsal roots of the left spinal nerves. These curves were 

 constructed as those in Fig. 4. 



