. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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 a. m. to p. m. on this day was 1 hour and 43 minutes. During a portion of this period (from to 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
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 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 a. m. to p. m. on this day was 1 hour and 43 minutes. During a portion of this period (from to 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. /U^yp- Fig. 13.—Graph representing flight data for May 9, 1922, a day of good flow of locust honey minutes between 7 and a. m., followed by rather sudden lengthening of the trips from 36 minutes to 106 minutes between and 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 m 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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