Hardesty, Spinal Nerves of the Frog. iii 



Plates IX and XI contain two sections each as the root is divided in the 

 same manner as the ventral root of IXth nerve, Plate VI. 



All the figures are reduced to about ^ the size of the photographs from 

 which they were made. 



Plates VIII, X and XII are companions to Plates IX, XI and XIII respect" 

 ively. They show the fields as marked out on the photographs during the 

 counting and also the number of fibers determined for each field. The bound- 

 aries of each figure coincide with those of the companion photograph. The 

 total number of fibers determined for each section is placed at the lower right 

 hand of each figure. 



The black dots in the center of each fiber represent the holes made by the 

 needle of the "counter," Plate VII, Fig. 7. This dot is sometimes obscured 

 in the reproduction, especially in case of some of the smallest fibers where the 

 small white axis cylinder space is obliterated by the puncture which is repro- 

 duced in black like the medullary sheath. 



Blood vessels are also reproduced in black. 



A hand lens will facilitate the examination of the prints. 



PLATE VIII. 

 Fig. I. Companion figure to Fig. i, Plate IX. 

 Fig. 2. Companion to Fig. 2, Plate IX. 



PLATE IX. 



Figs. I and 2. Transverse sections of ventral root, Vlllth nerve, from re- 

 gion corresponding to level i, Plate VI. 



,T CL X- f Fig. I. 300 diameters. 



Magnification : < -c- z.. j- 



^ ( tig. 2. 310 diameters. 



PLATE X. 

 Fig. 1. Companion to Fig. i, Plate XI. 

 Fig. 2. Companion to Fig. 2, Plate XI. 



PLATE XI. 



Figs. I and 2. Transverse sections of same ventral root but from region cor- 

 responding to Level 2, Plate VI. 



T,. -r ,. f Fig. I. 284 diameters. 



Magnification: ■< -c.-^ _, j- 



^ I. Fig. 2. 275 diameters. 



