18 
BULLETIX 1328, U. S. DEPARTMEXT OF AGRICULTURE 
of their bodies that they have been caught in the storm and after 
drying havfe flown back to the hive. 
Showers, if they are of sufficient strength, produce the same effect 
as a severe storm, the periodicity of the curve corresponding exactly 
with the time of each shoT^er. The effect of a shower of rain last- 
ing only from 5 to 10 minutes is well illustrated by the records for 
May 19 (fig. 6). where a marked depression in the two curves is 
produced, the record of the weight of the hive showing a sudden 
increase during the shower, to be followed immediately by an equally 
abrupt decrease on the resumption of clear weather. 
.S70 
I 1 
Fig. 6.— Fli 
jht, tempei-ature, and hive-weight data for May 19. 1922, showing the 
effect of a shower of short duration on flights 
The flight on an overcast day with some rain is illustrated by 
that of May IS (fig. T). The day set in dull with the following 
weather records : 
Time Weather conditions 
6.00 to 9.15 Heavily overcast. At 6.30 a shower of short duration occurred. 
9.15 to 10.15 Sprinklins:. 
10.15 to 11.00 Li^lit mill. 
11.00 to 11.45 Sprinkling. 
11.45 to 12.15 Steady rain. 
12.15 to 1.00 Heavy rain. 
1.80 Liirht. steady rain. 
2.00 Sprinklin.i?. 
2.15 It has stopped sprinkling. 
2.45 Brighter, though still overcast, light frequently varying in 
intensity. 
3.00 Becoming darker again. 
3.15 Heavily overcast. 
1.00 
to 
1.30 
to 
2.00 
to 
2.15 
to 
2.45 
to 
3.00 
to 
