. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE FLIGHT ACTIVITIES OF THE HONEYBEE 19 to A few drops are falling. to Sprinkling. to Steady shower falling. to Sun shining brightly, though shower continues. Rain has stopped, bright sunshine. Again clouding over. A few drops falling. The sun is shining through the clouds for brief intervals. Although this day occurred between others of good honey flow, the hive showed a loss in weight. An apparent gain in early after- noon was due to water on the hive. Each
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE FLIGHT ACTIVITIES OF THE HONEYBEE 19 to A few drops are falling. to Sprinkling. to Steady shower falling. to Sun shining brightly, though shower continues. Rain has stopped, bright sunshine. Again clouding over. A few drops falling. The sun is shining through the clouds for brief intervals. Although this day occurred between others of good honey flow, the hive showed a loss in weight. An apparent gain in early after- noon was due to water on the hive. Each period of rain caused a decrease in flight, the heavy rain about noon causing the greatest decrease. In each case the bees resumed flight promptly with the slightest improvement of weather Fig. 7.—Flight, temperature, and hive-weight data for May 18, 1922, showing the effect on flight of an overcast day with occasional showers THE EFFECT OF WIND Unfortunately for a thorough study of the effect of wind, there were few days during the period of these observations when the wind was strong enough to affect the flight appreciably. The in- formation is drawn from the records of only five days, and such statements as can be made on this subject are therefore made with some reservation. April 11 was a windy day, with no substantial honey flow. The successive numbers of exits increased with the rise in temperature until a. m. During this period the velocity of the wind was only 4 to 5 miles per hour. Between and 9 a. m. the wind velocity reached 10 miles per hour and the flight dropped and con- tinued low, while the velocity of the wind increased to 11 and 15 miles per hour. At 2 p. m. the velocity fell to 6 miles per hour and later to 4 miles, with the flight responding by an increase, which no other observed factors would explain. This record might suggest that a velocity of 10 miles per hour is the minimum velocity appreciably affecting flight. However, this
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