Cradle- Cells. 139 
The workers also take care of the eggs and 
the young bees, but do not generally lay any 
eggs themselves; only the queen does that. 
They make wax, build comb, and keep 
the hive clean, carrying out dead bees, or 
anything that does not belong in it. 
No doubt they watch at the door, too. 
For bees keep sentinels always on guard 
to see that thieves and robbers do not 
come in and steal their honey. 
If you knock on a hive, the sentinels 
will fly out to see what is the matter. 
In a few days the young bees leave the 
home work to the newly hatched, and go 
forth to gather honey, and pollen, and 
bee-glue. 
You ought to know that bee-glue is 
called propolis, —a word that means “ before 
the city,’—and it is so named, because 
the bees use it to build fortifications in 
time of war. 
Certain moths attack bee-hives by crawl- 
ing in and laying their eggs in the corners. 
