30 



BULLETIN 1328, U. S. DEPARTMENT' OP AGRICULTURE 



from 4.15 to 5.15 p. m., the generous assumption may be made that all 

 this error accumulated between 4 p. m. and 7.30 p. m. Applying a 

 correction under this assumption to the number of bees in the field 

 and the returns for this period, it is found on calculation that the 

 duration of the voyage has been increased by 0.39 minute, still show- 

 ing that the average duration of the flight has been reduced after the 

 occurrence of the threatening storm. This error, however, should 



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Pig. 12. — Graph representing flight data for July 10, 1922, a day of honey dearth 



properly have been distributed over the whole day, so that its magni- 

 tude was actually much below the above figure. 



In attempting to determine what factors are involved in this 

 reduction in the duration of the trips, three things are suggested : 

 (1) That the lower temperature prevailing after the storm stimu- 

 lated the bees directly; (2) that the lower temperature and the 

 conditions during and after the storm stimulated a relatively 

 heavier secretion, enabling the bees to load more rapidly; or, per- 

 haps, (3) that since fewer bees were visiting the flowers during the 

 threatening storm, relatively more nectar was available to them on 



