MOVABLE-FRAME HIVES. 159 
other labored contrivances, so complicated as to require 
almost as close supervision as a hot-bed or green-house. 
SSS 
—— 
SSS 
SS 
——— 
HH ; ib. 
iy 
i! i 
HIVE, WITIE EXTRACTING SUPERS SET BACK FOR VENTILATION 
IN VERY HOT WEATHER. 
The cap is thrown back to show the straw mat. 
334. With an independent bottom-board, ventilation can 
‘ 
