THE FLIGHT ACTIVITIES OF THE HONEYBEE 
21 
To present all the data from which the following conclusions on 
the effect of temperature have been reached would unduly increase 
the volume of this paper. Such as are essential have been inserted 
in the curves for the flights of May 15 (fig. 4), May 19 (fig. 6), May 
20 (fig. 8), July 8 (fig. 5), July 10 (fig. 9), and July 12 (fig. 10); 
and these curves have been presented mainly to illustrate phases of 
behavior other than the responses of bees to temperature. 
Fig. 9. — Bright, temperature, and hive-weight data for July 10, 1922, a day in a 
time of dearth 
A study of the temperature at which flight commenced on each of 
the successive days of this investigation shows : 
1. Under a particular set of conditions this temperature is un- 
iformly within 2° to 3° C. of a certain definite temperature, which 
however, is not the same throughout the season. During April 
flight usually began between 12° and 14° C. (53.6° and 57.2° F.). 
In May the temperature at which the first bees came out was usually 
i 
^ 
%t 
t::- 
^ 
J 
1^ 
vP 
A 
v~Vr 
y 
dm 
"X 
^\ 
^r= 
^tX 
-c^ 
i 
Fig. 10. — Flight, temperature, and hive-weight data for July 12, 1922, a day in 
a time of dearth 
from 14° to 16° C. (57.2° to 60.8° F.), with the main flight beginning 
at 16° or 18° C. (60.8° or 64.4° F.). In June and July the tempera- 
ture at which flight commenced was very inconstant, varying be- 
tween 13° C. (55.4° F.) and 27° C. (80.6° F.), being most fre- 
quently from 19° to 25° C. (66.2° to 77° F.), and showing that at 
this time of the year temperature is not often a factor in retarding 
the beginning of flight. 
