April, '22] 



PARK : BEES, TIME AND LABOR FACTORS 



131 



In 1921, only 19 percent of the field trip records fell within the 41-50 

 minute class in which the peak of the curve appeared. About 48 

 percent fell between 30 and 60 minutes, and 76 percent were completed 

 within 1 hour. The mean time for field trips was 49 minutes but the 

 modal interval was 45 minutes. 



As shown in Fig. 3, B, the 3 and 4 minute records of hive stays by 

 nectar carriers comprised nearly 40 percent of the total number recorded 

 in 1920. Over 75 percent were completed within 10 minutes. The 

 average time for all hive stays was 11.6 minutes but the figure is not 

 very significant owing to the markedly skew form of the curve. The 

 modal or most frequent interval spent in the hive between field trips was 

 3.9 minutes. 



In 1921, the records of hive stays were more widely scattered than in 

 the preceding year. The peak of the curve fell within the 5-6 minute 

 period which included only about 23 percent of the records; but nearly 

 68 percent were completed in- 10 minutes or less. The mean time 

 was about 16 minutes while the modal interval was 5.5 minutes. 



35 



so 



15 



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Fig. 4. Showing the frequency distribution of time records for round trips made 

 by nectar carriers under favorable and unfavorable honeyflow conditions. • 



Nearly 25 percent of the round trips recorded for 1920 fell within 

 the 31-40 minute period as shown in Fig. 4. Just 66 percent occupied 

 between 20 and 50 minutes each, and 90 percent were completed in less 

 than IX hours. The mean time was 45 minutes, whereas, the modal 

 or most frequent time was only 35 minutes. 



