K-269 (MAXIMUM) 
K-257 (MEAN) 
K-246 (MINIMUM) 
200 300 
AGE IN DAYS 
Figure 1 32. — Growth in body length lor males (body length was measured as the distance from the tip of the nose to 
the beginning of the tail). The three curves were similarly determined as for weight in figure 1 30. 
Table 58. — Variability in body length associated with changes in weight 
Weight change 
A 
Not calculated 
B 
Decrease of 25 or more 
grams 
C 
Increase of 25 to 75 
grams 
Days elapsing between 1st and subsequent capture. . 
Age in days 
1 to 7 
100 or more . . 
Mean circa 30 
260 or more 
Mean circa 45. 
260 or more. 
71. 
+ 3.761. 
N. " 
128 
85 
Mean change in body length in mm. from one record 
to the next. 
-0.047 
-0.141 
Here the N represents all available comparisons 
in each category. Apparent significance of these 
data: 
a. Column A represents the observor’s error in 
making measurements. 
b. There is an increase in body length accom- 
panying increase in body weight (A to C 
comparison) . 
c. Increase in body length ceases following loss 
of body weight. 
In fact, there is an indication that a slight shrinking 
of the body accompanies weight loss. 
It may be seen that I selected the extreme 
category of relationship between body weight and 
growth as indicated by changes in body length. 
I am further assuming, that, during those ages 
when growth may actively proceed, any conditions 
which inhibit optimum increases in weight will 
also inhibit other manifestations of growth. In 
the charts of growth of litters born during 1948, 
219 
