34 BEE-KEEPING FOR PROFIT 
but the one I have found to give most satisfac- 
tion holds from three to five standard frames. 
These are used solely for the purpose of rearing 
young queens to take the place of those worn 
out by hard work or old age. The method 
to be followed in this direction is given on 
page 75. 
Observation Hive.—This consists of a glass 
case made to hold one standard frame, a shallow 
frame, and a row of sections. The bees can 
thus be seen at work on the combs. It is 
mounted on a pivot, through which the bees 
must pass to the entrance. Of course, the 
‘‘ observation hive ’’’ is not intended to keep 
bees in for more than a few days at a time, 
and when it is in use care should be taken 
not to expose the combs or the bees to the 
heat of the sun. 
