22s NAOKI SUGITA 
II. MATERIAL 
For the present study on cell size in the cerebral cortex, the 
frontal and horizontal sections of the Albino brains which were 
used earlier for studies on the cortical thickness, cortical areas, 
and cell density (Sugita, ’17 a, ’18b) were alone taken. No 
locality in the sagittal sections was examined. ‘These sections 
were from 128 individuals, sexes combined. The data for these 
128 rats appear in tables 1 and 2 in a previous paper (Sugita, 
17 a) and it is not thought necessary to repeat the tables here. 
This study was begun in January, 1916, and carried on with in- 
terruptions till February, 1917, at The Wistar Institute of 
Anatomy and Biology. 
a. F b 
We 
H Xe H’ 
a 
F’ 
Fig. 2 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. 
b = the lateral view of the same. 
Ill. TECHNIQUE 
The nerve cells have been measured at fixed localities in the 
sections; that is, in the frontal sections at locality VII (fig. 4, 
Sugita, 717 a) and in the horizontal sections at locality X (fig. 6, 
Sugita, 717 a). For convenience, these localities are here shown 
on two corresponding figures (fig. 2, a and 6). From the lamina 
pyramidalis and the lamina ganglionaris at each of these locali- 
ties, ten of the largest cells were selected and measured. The 
cells in the other layers were not systematically investigated, 
