February, '17] headlee: humidity and metabolism 



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Table Showing the Effect of Atmospheric Moisture upon the Length of Adult Life for the Angoumois 

 Grain Moth and the Bean Weevil 



Date of beginning 



No. of days in period 



No. of days to maximum 



Angoumois grain moth 



Bean Weevil 



It seems that a decrease in atmospheric moisture increases the 

 speed of metabolism in the moth and decreases it in the bean weevil. 



The next phase investigated was the effect of humidity upon the 

 length of the entire life cycle. 



Table Showing the Influence of Atmospheric Moisture upon the Length of Life Cycle in the Bean Weevil 



It is apparent from the records of the first and second brood that 

 the rate of metabolism is decreased by a reduction in atmospheric 



