WATER CONTENT AND RATE OF METABOLISM 
147 
higher temperature of 38°C. The two experiments represented 
show results typical for many others obtained at different inter- 
vals during this four-month period. It will be noted that a 
marked and steady increase in body weight takes place, until 
at the end of approxmiately three weeks, the maxmium for the 
species is attained. The percentage of water, on the other hand. 
Fig. 1 Curves show the water content and weight relations of Chortophaga 
viridifasciata, during four months, from October 8, 1919, to January 1, 1920, out 
of doors, and also the effects of 38°C. on these relations in 'hibernating' nymphs. 
Abscissas, time in weeks indicated. Ordinates, at the left, the percentage of 
water. Ordinates, at the right, body weight in grams. For further explanation 
see description in text. 
undergoes rather striking and regular changes. A slight decrease, 
followed by a rapid increase to a maximum of 75 per cent and 
accompanied by active growth, and a correspondingly rapid 
decrease, closely connected with the later stage of the animals' 
life, occur. Such a result strikingly confirms conclusions arrived 
at in an earlier section in which such differences in water content 
were shown to be correlated with the age and not the body weight 
of an animal. 
