﻿20 



BULLETIN 1364, U. S. DEPAETMENT OF AGEICULTTJEE 



had been sprayed. None of the 10 samples of pollen carriers, col- 

 lected on May 10 and 11 was, when analyzed, found to contain 

 arsenic. Of 10 samples of dead bees collected on May 14 and 22 in 

 front of the hives, arsenic was found in only 3, and these came from 

 three colonies which apparently had been suffering for some time 

 from bee paralysis. However, no arsenic was found in samples of 

 23ollen taken from two of the three hives. 



Table 5. — Results oMaified iy weigMng honeybees at Drummond, Md., 1911, to 

 detennine the effect on them of spraying fruit trees at the customary time 



Colony No. 



Weight of adult bees (before spraying) on the dates specified 



Apr. 27 



Apr. 28 



Apr. 29 



Apr. 30 



May 1 



May 2 



Mays 



May 4 



May 5 



May 6 



1 -_-._- 



Ounces 

 89.00 



100. 50 

 63.50 

 98.00 



111. 00 

 57.00 



Ounces 

 84.00 

 89.50 

 55.25 

 97.50 



108. 00 

 50.00 



Ounces 

 83.75 

 85.75 

 57.00 

 90.00 

 99.75 

 52.00 



Ounces 

 81.50 

 87.50 

 54.00 

 91.00 

 96. 60 

 48.75 



Ounces 

 76.00 

 85.50 

 54.00 

 83.00 



' 91. 50 

 47.50 



Ounces 

 75.00 

 89.25 

 53.00 

 84.50 

 90.00 

 46.50 



Ounces 

 73.00 

 81.50 

 54.00 

 84.25 

 88.25 

 45.50 



Ounces 

 73.00 

 82.50 

 51.50 

 83.00 

 87.50 

 45.50 



Ounces 

 69.50 

 81.25 

 49.50 

 77.00 

 83.25 

 43.75 



Ounces 

 66.25 



2 



78.00 



3 



47.00 



4 



73.25 



5 



77.50 



6 



42.50 







Total weight 



DaOy loss or gain . 

 Average daily 

 weight per indi- 

 vidual bee in col- 

 ony No. 6 



519. 00 



Gram 



484. 25 

 -34. 75 



Gram 

 0. 1060 



468. 25 

 -16. 00 



Gram 

 0. 0965 



459. 25 

 -9.00 



Gram 

 0. 0974 



437. 50 

 -21. 75 



Gram 

 0. 1087 



438. 25 

 -fO. 75 



Gram 

 0. 0990 



426. 50 

 -11.75 



Gram 

 0. 0973 



423.00 

 -3.50 



Gram 

 0. 0958 



404. 25 

 -18. 75 



Gram 

 0. 0852 



384. 50 

 -19. 75 



Gram 

 0. 0923 









Colony No. 



Weight of adult bees (after spraying) on the dates specified 



May 71 



May 8 



May 9 



May 10 



May 11 



May 12 



May 19 



May 26 



June 2 2 



June 9 



1 



Ounces 

 69.00 

 78.50 

 52.25 

 83.00 

 85.00 

 47.25 



Ounces 

 61.00 

 74.50 

 47.25 

 71.25 

 77.75 

 42.75 



Ounces 

 64.00 

 72.00 

 49.00 

 69.00 

 75.00 

 45.25 



Ounces 

 63.25 

 73.50 

 45.25 

 71.50 

 72.50 

 42.50 



Ounces 

 59.50 

 70.25 

 44.50 

 67.00 

 74.00 

 40.50 



Ounces 

 55. 00 

 65.50 

 43.75 

 65.00 

 69.25 

 38.75 



Ounces 

 48.00 

 62.75 

 40.50 

 61.50 

 57.50 

 32.00 



Ounces 

 49.00 

 56.75 

 36.00 

 53.7^ 

 49.25 

 30.00 



Ounces 

 46.00 

 53.00 

 32.25 

 51.50 

 26.00 

 30.50 



Ounces 

 45.50 



2 



44.25 



3 



25.00 



4 



40.50 



5 



31.00 



6 . 



20.00 







Total weight 



DaUy loss or gain. 

 Average daily 

 weight per indi- 

 vidual bee in col- 

 ony No. 6 



415. 00 

 +30. 50 



Oram 

 0. 0953 



374. 50 

 -40. 50 



Gram 

 0. 1131 



374. 25 

 -0.25 



Gram 

 0. 0910 



368. 50 

 -5.75 



Gram 

 0.0893 



355. 75 

 -12. 75 



Gram 

 0. 0992 



337. 25 

 -18. 50 



Oram 

 0. 0922 



302. 25 

 -35. 00 



Gram 

 0. 1092 



274. 75 

 -27. 50 



Gram 

 0. 1030 



239. 25 

 -35. 50 



Gram 

 0. 1390 



206. 25 

 -33.00 



Gram 

 0. 1242 







1 Eleven neighboring trees sprayed. 



' Heavy honey flow from June 2 to June 9. 



Table 6 is a summary of the results obtained by weighing bees 

 at Winchester, Fennville, and Drummond. The daily losses in 

 ounces, recorded in Tables 2 to 5, have been changed to percentages. 

 For comparative purposes these percentages and the theoretical 

 normal daily mortalities are represented in Table 6 as accumulated 

 daily losses. The daily losses of the bees at either Fennville, Win- 

 chester (1916), or Drummond may be compared singly with the 

 theoretical daily losses, or the average daily losses recorded for 

 these three localities may be compared with the theoretical figTires. 

 Since no weight records were taken at Winchester in 1915 before 

 the spraying was begun, the percentages for this locality after the 

 spraying was begun are not averaged with those of the other three 

 localities, but are merely given for general purposes of comparison. 



