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Pig. 17. Pupal velocity chart showing the two-hourly readings of temper- 

 ature and humidity from April 17 to May 15 at Olney, 1916. Each black dot 

 represents the condition of temperature and humidity at some even hour. The 

 number of items (N), the mean temperature (T), the mean humidity (H), 

 and the mean velocity (V) are for the dots falling between the triple velocity 

 lines (5-unit intervals) are shown in the margin at the right. 



