86 



ANATOMY 



Table 49 gives the mean values for each brain weight group 

 and the same are shown graphically in chart 10. 



Fig. 9 Showing, by shading, the cortical area measured on the frontal sec- 

 tion of the albino rat brain. The dorsal border (d) is chosen at the borderline 

 of the corpus callosum. The ventral border (v-v') was drawn perpendicular 

 to the surface at the basal end of the cell group found near the fissura rhinalis, 

 latero-basal to the capsula externa. The double shaded part, locality VII, 

 indicates the areas (lamina pyramidalis and lamina ganglionaris) where the 

 cell number and cell size were determined. 



a 



Fig. 10 Showing on the brain surface the localities at which the sizes of the 

 pyramids and the ganglion cells were measured. FF' indicates the level from 

 which the frontal section was taken and HH' indicates the level from which 

 the horizontal section was taken. VII = locality VII; X = locality X. a = 

 the dorsal view of an Albino brain weighing 1.5 grams. Enlarged 1.8 diameters. 

 6 = the lateral view of the same. 



