WEATHER AND' CHANGE IN WEIGHT OP BEE COLONY 



31 



periods when the net gains are approximately identical. For the 

 spring day, the morning loss was small and ceased at 8 o'clock. From 

 this time on the colony gained slowly but steadily until the close of 

 day. Apparently only partial loads were carried during most of the 

 day, and the bees made short trips to the field. Had either one of 

 these two suppositions not been true, the morning loss would have 

 been larger, or, if the bees had carried maximum loads and had made 

 short trips, only a small portion of the field force would have been 

 engaged in gathering. The fall day shows a tremendous morning 

 loss with a regaining of the original weight late in the afternoon. Such 

 a heavy loss, scattered over so many hours, faould justify one in 

 believing that the entire field force was active, and that the indi- 

 vidual bees made long trips and perhaps carried but partial loads. 

 Figure 9 (B) illustrates another day (September 25) of the fall period 

 when the bees must have made tremendous efforts to secure what 

 nectar was available. Table 4 presents various data relating to the 

 fall honey flow of 1922. 



Table 4. — Changes in loeight of colony B, and various weather data during the fall 



honey flow 









Diur- 



Diur- 



Diur- 



Diur- 

 nal 



rela- 

 tive 

 hu- 

 midity 







Noc- 



Noc- 



Noc- 



Noc- 

 turnal 

 rela- 

 tive 

 hu- 

 midity 







Diur- 





nal 



nal 



nal 







turnal 



turnal 



turnal 





Date 

 (19221 



nal 



Noc- 



aver- 



tem- 



aver- 



Sun- 

 shine 



Solar 



aver- 



tem- 



aver- 



Morn- 



change 



turnal 



age 



pera- 



age rel- 



radia- 



age 



pera- 



age rel- 



ing 



in 



loss 



tem- 



ture 



ative 



tion 



tem- 



ture 



ative 



loss 





weight 





pera- 



varia- 



hu- 







pera- 



varia- 



hu- 











ture 



tion 



midity 



tion 







ture 



tion 



midity 



tion 







Grams 



Grams 



°F. 



°F. 







Hours 





°F. 



°F. 







Grams 



Sept. 4 



-130 



80 



87.5 



20 



69.3 



44 



11.7 



438.3 



77.5 



9 



97.1 



5 



450 



5 



-70 



60 



85.3 



18 



68.6 



53 



9.6 



432.6 



73.2 



12 



97.7 



8 



420 



6 



-50 



60 



87.0 



26 



62.2 



60 



12.8 



490.6 



74.9 



13 



95.3 



11 



460 



7 



-10 



50 



87.6 



24 



64.5 



56 



8.7 



450.1 



78.0 



12 



96.0 



9 



390 



9 



-110 



90 



81.4 



13 



79.8 



39 



5.2 



277.5 



74.7 



7 



98.8 



4 



690 



10 



200 



130 



83.9 



15 



68.6 



47 



8.1 



410.9 



75.7 



6 



97.7 



10 



410 



12 



-20 



20 



75.1 



9 



71.6 



54 



6.3 



301.4 



61.0 



14 



97.5 



10 



820 



13 



290 



120 



74.6 



27 



54.5 



64 



12.5 



495.2 



64.9 



9 



96.1 



9 



800 



14 



550 



200 



81.9 



27 



58.0 



48 



12.5 



478.9 



74.0 



11 



95.5 



14 



850 



15 



550 



170 



84.7 



21 



66.3 



55 



11.1 



464.4 



74.8 



9 



97.5 



6 



920 



17 



50 



90 



69.6 



19 



56.0 



55 



7.9 



308.0 



55.7 



11 



95.6 



8 



1,010 



18 



90 



170 



69.0 



22 



53.3 



36 



10.4 



413.6 



61.9 



5 



90.8 



9 



1,080 



19 



370 



190 



70.5 



18 



63.3 



51 



5.7 



271.9 



61.1 



13 



97.7 



13 



1,170 



20 



380 



190 



66.9 



18 



76.1 



45 



6.4 



289.1 



62.5 



8 



98.1 



8 



1,185 



21 



690 



290 



70.7 



15 



68.6 



48 



3.7 



311.9 



61.5 



13 



97.0 



11 



1, 310 



22 



410 



235 



69.6 



22 



68.5 



57 



3.2 



323.2 



60.5 



14 



98.3 



6 



1,510 



23 



1,395 



390 



77.4 



33 



58.2 



72 



10.4 



397.3 



65.8 



17 



96.9 



10 



1,430 



24 



960 



510 



78.3 



32 



66.5 



62 



6.0 



329.8 



68.4 



23 



71.5 



49 



1,620 



25 



-220 



170 



67.7 



18 



46.2 



71 



12.0 



540.0 



50.1 



13 



91.1 



19 



1,690 



26 



310 



220 



61.2 



25 



49.2 



70 



12.0 



474.5 



51.2 



10 



96.7 



ik 



1,360 



27 



1,110 



340 



68.9 



32 



60.0 



60 



12.0 



448.9 



61.6 



13 



96.5 



1,260 



28 



680 



300 



71.3 



34 



58.8 



70 



11.7 



404.3 



61.2 



10 



97.0 



15 



1,495 



29 



300 



230 



72.9 



22 



71.9 



51 



7.9 



346.5 



62.0 



17 



97.8 



7 



1,300 



30 



660 



300 



73.0 



28 



64.5 



56 



11.8 



413.5 



60.2 



16 



96.9 



11 



1,190 



Oct. 1 



440 



230 



74.4 



30 



61.0 



64 



11.8 



431.5 



58.8 



6 



97.1 



11 



1,190 



2 



380 



220 



75.2 



34 



63.4 



66 



11.6 



396.8 



60.1 



16 



98.5 



7 



1,150 



3 



350 



215 



76.6 



34 



62.0 



64 



11.7 



361.1 



65.5 



13 



97.7 



8 



1,070 



4 



215 



210 



78.0 



27 



63.9 



60 



10.8 



306.6 



69.5 



12 



95.5 



9 



1,005 



5 



240 



225 



83.0 



32 



53.5 



74 



11.6 



365.5 



69.6 



14 



87.0 



23 



900 



It must be recalled that the data in the spring and fall periods are 

 not entirely comparable, since days were not chosen in the fall with 

 a minimum net gain of 980 grams. The difference between the 

 correlations of temperature and net gain in the two periods is, how- 

 ever, so striking as to call for an explanation, and no definite ex- 

 planation seems to be available. In determining the cause of this 

 difference in correlation in the two periods it must be remembered 



