WATER CONTENT AND RATE OF METABOLISM 
149 
to readjust their water relations when exposed to decreased 
temperatures. The animal's ability to regulate its moisture 
content seems to be connected with its ability to grow and 
withstand adverse conditions. 
TABLE 4 
Shoioing the percentage changes dn weight, water, and solids in 'hihernating ' Chorto- 
phaga viridifasciata ivhen exposed to differences in relative humidity 
PERCENTAGE OF 
TIME 
NUM- 
BER OF 
ANI- 
MALS 
TEM- 
PERA- 
TURE 
INITIAL 
WEIGHT 
Water 
Change 
in 
weight 
Change 
in 
water 
Change 
in 
solids 
REMARKS 
grams 
hours 
°c. 
0.4130 
66.4 
-2.S 
-3.7 
-0.7 
4S 
5 
4 
In 
cage with sand 
0.4640 
66.2 
-1.7 
-3.3 
+1.6 
48 
5 
4 
In 
jar with sand 
0.2950 
60.5 
-10.4 
-23.9 
+16.1 
48 
5 
15 
In 
jar with sand 
0.3250 
61.3 
-8.0 
-15.5 
+5.0 
24 
5 
23 
In 
jar with sand 
0.3560 
59.5 
-14.6 
-23.6 
+2.1 
48 
5 
23 
In 
jar with sand 
0.4150 
60.5 
-24.9 
-41.6 
+7.1 
24 
5 
38 
In 
jar with sand 
0.4180 
65.4 
-2.8 
-5.7 
+1.7 
48 
5 
4 
In 
desiccator 
0.3810 
60.5 
-9.9 
-17.7 
+7.0 
48 
5 
15 
In 
desiccator 
0.3695 
60.0 
-7.3 
-16.2 
+ 10.5 
24 
5 
23 
In 
desiccator 
0.4315 
60.1 
-14.7 
-23.5 
+2.4 
48 
5 
23 
In 
desiccator 
0.3730 
59.9 
-24.1 
-34.0 
-4.4 
24 
5 
38 
In 
desiccator 
0.5170 
68.1 
-1.4 
+3.5 
-10.7 
48 
5 
4 
In 
jar with wet sand 
0.4230 
64.8 
+3.5 
+0.5 
+9.5 
48 
5 
15 
In 
jar with wet sand 
0.3830 
62.5 
' +0.5 
+0.3 
+0.7 
24 
5 
23 
In 
jar with wet sand 
0.5810 
71.6 
+ 14.3 
+22.6 
-2.3 
48 
5 
23 
In 
jar with wet sand 
0.3950 
73.0 
+ 15.5 
+28.0 
-9.0 
24 
5 
38 
In 
jar with wet sand 
0.4345* 
64.6 
-14.8 
-18.0 
-8.1 
24 
5 
38 
In 
jar with wet sand 
0.4660* 
64.4 
-14.8 
-18.7 
-6.6 
24 
5 
38 
In 
desiccator 
0.4840* 
61.9 
-3.7 
+1.9 
-15.6 
24 
5 
38 
In 
jar with wet sand 
+ = gain, — = loss. * = animals previously kept at 38°C. 
B. Effects of starvation 
Before dealing with the direct effects of star^'ation on water 
content, solids, and body weight of these animals, some points 
of general interest deserve consideration, one of which is length 
of the starvation period. It is found that adults of Melanoplus 
f. rubrum endure complete star\'ation approximately 73 hours, 
while with water, but no food, they live as long as 144 hours 
