THE FLIGHT ACTIVITIES OF THE HONEYBEE 
31 
the resumption of optimum conditions for flight. The third factor 
seems the most probable. 
July 10 is a good example of a day of great dearth with long 
flights (fig. 12). The average duration of the voyages in the period 
from 10.45 a. m. to 3.30 p. m. on this day was 1 hour and 43 minutes. 
During a portion of this period (from 12.36 to 1.15 p. m.) all the 
bees (about 1,400) which set out from the hive were absent for as 
long an interval as 1 hour and 54 minutes. The curve shows a 
gradual lengthening of the duration of the trips from 15 to 36 
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Fig. 13. — Graph representing flight data for May 9,. 1922, a day of good 
flow of locust honey 
minutes between 7 and 8.45 a. m., followed by rather sudden 
lengthening of the trips from 36 minutes to 106 minutes between 
8.45 and 10.45 a. m., which is the beginning of the period of ap- 
proximate flight equilibrium mentioned above. At the end of the 
day, as the flight activity comes to a close, a gradual shortening of 
the duration of the trips is noted. A comparison of the evening 
shortening with the morning lengthening in the duration of the 
voyages shows that the lengthening in the morning is somewhat 
sudden, whereas the shortening in the evening is more gradual. 
These characteristics were noted on all the days studied. The 
