THE FLIGHT ACTIVITIES OF THE HONEYBEE 



21 



To present all the data from which the following conclusions on 

 the effect of temperature have been reached would unduly increase 

 the volume of this paper. Such as are essential have been inserted 

 in the curves for the flights of May 15 (fig. 4), May 19 (fig. 6), May 

 20 (fig. 8), July 8 (fig. 5), July 10 (fig. 9), and July 12 (fig. 10); 

 and these curves have been presented mainly to illustrate phases of 

 behavior other than the responses of bees to temperature. 



Fig. 9. — Flight, temperature, and hive-weight data for July 10, 1922, a day in a 



time of dearth 



A study of the temperature at which flight commenced on each of 

 the successive days of this investigation shows : 



1. Under a particular set of conditions this temperature is un- 

 iformly within 2° to 3° C. of a certain definite temperature, which 

 however, is not the same throughout the season. During April 

 flight usually began between 12° and 14° C. (53.6° and 57.2° F.). 

 In May the temperature at which the first bees came out was usually 



Fig. 10. — Flight, temperature, and bive-weight data, for July 12, 1922, a day in 



a time of dearth 



from 14° to 16° C. (57.2° to 60.8° F.), with the main flight beginning 

 at 16° or 18° C. (60.8° or 64.4° F.). In June and July the tempera- 

 ture at which flight commenced was very inconstant, varying be- 

 tween 13° C. (55.4° F.) and 27° C. (80.6° F.), being most fre- 

 quently from 19° to 25° C. (66.2° to 77° F.), and showing that, at 

 this time of the year temperature is not often a factor in retarding 

 the beginning of flight. 



