RAISING AND INTRODUCTION OF QUEENS. 309 
The main part of the apparatus is really a hive, 
with double walls of zinc or tin plate (the former is 
far the more durable, and is not open to any valid 
objection, if varnished within with shellac, dissolved in 
spirits of wine), the space between which, about an 
inch, may be filled with water (W, W), to entirely sur- 
WC 
Fig. 85.— Lamp Nursery in Sectio.n— A uthor’s Arrangement (Scale, i\,). 
W, W, W, Water in Zinc or Tin-plate Double Cistern : P, Packing to Retain Heat ; 
Open Water-trough ; xt, xt. Staples ; wc, Wooden Case ; /, Funnel ; 
fh, Thermometer ; c, Cone of Metal ; I, Lamp ; hi, hi, Riiising-blocks. 
round the contents of the nursery, except on the top. 
To assist in the filling, a pipe, surmounted by a small 
funnel {f), is passed through the outer case {wc)^ 
and enters the water cistern at the top. On the 
opposite side another and smaller pipe is provided, to 
allow the contained air to escape. The weight of water 
