362 
BEES AND BEE-KEEPING. 
be swung on central pivots (/>, A, Fig. 92), so that 
bees collecting on the glass, whither they are drawn 
by the light, may be placed on the outside by giving 
the sash a half-rotation, and fixing it in its place by 
a bolt. After the bees have wearied themselves by 
fluttering on the glass, they usually collect in little 
knots above the sash, whence they must be brushed 
if they are to be removed ; but by adding to the sash 
the guards g, g' , which may be of perforated zinc or 
rough wood (although in the latter case drainage 
should be permitted), the bees will congregate at c, 
Fig. 92 .— Arrangement of Windows in Operating-room. Sections. 
A, Revolving Window— j/;, Pivot ; pi, Glass ; ssb, sb, Sashbar : g, rf, guards ; c, c', 
Position of Clustering Bees. B and C. Windows with (o, o) Escape Slots— 
pz, pz! , Perforated Zinc ; /, Fixing ; other Letterings as before. 
and will, in consequence, be carried out to c by the 
aforesaid half-revolution of the window. 
Bees, in striving to find an escape, fly up the front 
of the pane, and then drop to the bottom of it, so 
that, if the glass [gl, B) do not meet the lower 
sashbar [sb) by about an inch, the captives there 
escape, while bees on the outside may be prevented 
from entering by covering the opening with perfo- 
rated zinc [pz) about six or eight inches wide, leaving 
a bee-space between it and the glass. This works 
