210 NAOKI SUGITA 
or the cortical volume is relatively undeveloped in comparison 
with the cell number (see above). In older brains weighing more 
than 1.0 gram or of ages above sixteen days, these discrepancies 
have been somewhat balanced, but, when compared with the 
controls, the underfed brains remain generally slightly higher in 
the cell density even in rats of sixteen days or older. 
Considered in relation to the facts presented in the previous 
chapter showing that the computed volume of the cortex is 
below the standard in the underfed brains weighing less than 1.0 
gram, it may inferred that the underfed brains, underdeveloped 
in weight and size, have a relatively higher cell density, because 
the normal number of cells is crowded into a cortex of smaller 
total volume. 
11. RELATIVE VALUE OF THE COMPUTED NUMBER OF CELLS IN 
THE ENTIRE CORTEX ‘ 
As previously shown (Sugita, 718 b), the computed number of 
nerve cells in the entire cortex may be obtained and the values 
compared among themselves by the use of the following formula: 
N XL XWDXT (LF) WD and 1, in ‘millimeters 
where N means the relative cell density represented by the sum 
of the cell numbers in the unit volume in the lamina pyramidalis 
and in the lamina ganglionaris (that is,-the number in two unit 
volumes), given in table 11, based on table 9, and L.F x W.D xT 
is the computed volume of the cortex, as already given in the 
foregoing chapter. 
In table 11, these relative values for the volume of the cortex 
and for the cell number in the cortex in the underfed Albinos 
are given for each group, each paired with the corresponding 
standard values for brains of the same age, all condensed from 
table 11 a (unpublished), which gives the corresponding data for 
each individual. Every standard value was taken from my 
previous presentation (Sugita, 718 b). Throughout the underfed . 
and the controls, these pairs of figures seem to be nearly in 
accord, showing on the average only 1.7 per cent excess in the 
underfed and 3.4 per cent excess in the control brains (average 
