METABOLISM OF INSECTS 



55 1 



here, the insects show a mechanism for 

 adjustment or acclimatization as evi- 

 denced by their carbon dioxide output. 



Above 31 the temperature has a 

 deleterious effect upon the organism, for 

 the insects respond but slightly to a 







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Fig. 4. Rate of C0 2 Output at Low Temperatures 



Abscissas, time in hours. Ordinates, at top, temperature in degrees Centigrade; at bottom, milligrams CO2 

 per gram body weight per hour. For further explanation see description in text. 



The greatest output is between 2.8 and 

 3i°C, this representing for the nymphs 

 the maximum in catabolic reactions. 



further rise in temperature. At this high 

 temperature the decreased carbon dioxide 

 production is no doubt accompanied by 



