Invertebrates The Observation Bee Hive 
once to remove it. They dump all of the debris out 
in front of the hive. They close all crevices in the 
hive; and they will always curtain the glass, if the 
door is kept open too much, with propolis or bee glue, 
which is a very sticky substance they collect from 
leaf buds and other vegetable sources. When bees 
fan to set up a current of air in the hive, they glide 
back and forth, moving the wings so rapidly that we 
can only see a blur about their bodies. 
If drones are developed in the hive, it is interesting 
to see how tenderly they are fed by their sister work- 
ers, although they do not hesitate to help themselves 
to the honey stored in the cells; and if the observa- 
tion hive is working during September, undoubtedly 
we may be able to see the murder of the drones by 
their sisters. But we should understand that this 
killing of the drones is necessary for the preservation 
of the colony, as the workers cannot store enough 
honey to keep the colony alive during the winter if 
the drones were allowed to go on feeding. 
If we see the worker bees fighting, it means that 
robbers are attempting to get at the stores of the 
observation hive. The entrance to the hive should 
at once be contracted-by placing a block of wood in 
front, so that there is room for only one bee at a time 
to pass in and out. 
REFERENCES 
How To Krep Bess, Comstock. 
“In Fuzzy’s Glass House,” Insect Stories, V. L. Kellogg. 
THE BEE PEopLeE, Morley. 
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