190 NAOKI SUGITA 
In connection with the underfeeding, as practiced in Series I, 
some interesting results of overfeeding have been noticed in the 
control animals; overfeeding having taken place in the case of the 
controls of Litters A to E on account of the periodic isolation of a 
number of the members of the litter. The controls have shown 
generally, as seen in table 4a (unpublished) and also in table 4, 
some excess in body and brain weights, as compared with the 
standard values for the same age. The excess in body weight is 
on the average 19 per cent (average of A, C. I and II, B, C. I and 
II, C, C. II, D, C. I and II, and E, C. II), while the brain weight 
is on the average 6 per cent (average of the above-cited cases) 
higher than the standard for the same age and 2 per cent higher 
than the standard for the same body weight. Thus, by moderate 
overfeeding, the growth in body weight is definitely accelerated 
and, at the same time, the growth in brain weight is also acceler- 
ated, nearly in proportion to the increase in body weight. 
If the observed brain weights are compared with the standard 
brain weights for the observed body weight, it is clearly seen 
that the observed brain weights are higher than the standard by 
24 per cent (average of all eight litters T. groups only). Of 
course, the younger the individual, the higher is the percentage, 
because the standard brain weight is smaller in the young animals 
and they are not increasing in direct proportion to the body 
weight, but nearly as the logarithm of the latter value. So it 
may be roughly stated that the brain weights in the underfed 
young albino rats have values below the standard weights for the 
same age and above those for the same body weights, but always 
falling nearer to the standard age values. 
6. THE SIZE AND SHAPE OF THE CEREBRUM 
The five diameters of the cerebrum of the underfed young were 
measured and recorded according to the procedure already 
described in my first paper of this series (Sugita, ’17, figs. 1 and 
2). The measurement W.5, represents the greatest frontal 
diameter; the measurement W.D, the frontal diameter passing 
the middle point of the fissura sagittalis; the measurement 
L.G, the greatest distance from the frontal pole to the occipital 
