118 PROFITABLE BEE-KEEPING 
but 2 inch down at the top, to allow for the 
frame top bars. 
Fic. 7 
Single-walled Hive 
The space between the inner and outer walls 
must be filled in with strips of wood. Place 
these strips flush at the bottom, but } inch below 
the level of the inner walls at top. It is well to 
bevel the top edges of these inside walls to a 
