194 NAOKI SUGITA 
cent in the controls. As a matter of fact, the measurement of 
Ht. could not be so accurate on’ account of difficulty in fixing the 
dorsal limit, so that these slight differences in Ht. should not be 
taken too seriously. The measurement of L.G and W.G can be 
made accurately so that these results are trustworthy. 
Taking these deviations in the controls into account, the 
general statement may be made that underfeeding alters the 
shape of the cerebrum, ‘so that it becomes slightly elongated, 
when compared with the normal cerebrum of the same weight. 
This difference is probably due to the fact that, although the 
underfed cerebrum is arrested in growth, it nevertheless tends to 
enlarge normally and, as already determined (Sugita, ’17) be- 
comes more and more elongated as the age advances. 
If, for the brains of like weight, the width-length indices 
W.D x 100 
obtained by the formula TT aaah eee compared between 
the underfed and the controls (compare table 9) or the standard 
values (based on table 3, Sugita, 717), it will be seen that the 
index value tends to be lower in the underfed, especially in the 
members of Litters F and G which were underfed continuously 
and rather severely. In the latter litters the index values for 
each individual are smaller by 2 to 7 points than the index values 
for the standard brains of like weights (the data for these calcu- 
lations are contained in table 9a, not here published). The 
average index values in Litters F and G are 102 (for T. I groups) 
and 97 (for T. II groups), while the corresponding standard 
values are, respectively, 106 and 103 (Sugita, 717). 
7. THICKNESS OF THE CEREBRAL CORTEX 
Tables 6 a, 6 b, and 6c (all unpublished) were originally pre- 
pared to give the cortical thickness for each individual as measured 
at the localities I to VIII in the sagittal and frontal sections and 
to give theaverage cortical thickness in each section and the general 
average thickness, to be compared with the respective standards 
presented in a former paper (Sugita, 17a). Table 6, which fol- 
lows, contains in condensed form the corrected data for the thick- » 
ness of the cerebral cortex of the underfed Albinos and that of 
