vI i MUN RER-BEE HOUSE 95 
be made to open. Inside the house are fitted two 
shelves, one on each side, extending from end to 
end of the house. Each shelf consists of a board 
9g in. wide and 1 in. thick, and is at a height of 
4 ft. from the ground. Each shelf will accom- 
modate four colonies. 
Figure 19 shows a vertical section through one 
of the domiciles. The comb is contained in wooden 





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FIG. 19.—Vertical Section through a domicile in Sladen’s Humble-bee House, 
sections or storeys, which are multiplied as it grows. 
At the bottom is the starting section, measuring 
only 24 in. wide by 33 in. long on top and 23 in. 
long at the bottom, with an entrance hole at the 
end. This storey is large enough to hold the comb 
until the first batch of workers is succeeded by 
others. Then a second storey, measuring 33 in. 
by 4 in., is placed over the first, and this when 
filled with comb is capped by a third and still larger 
storey, measuring 4 in. by 5 in. Prosperous nests 
of B. lapidarius and terrestris usually require a 
fourth storey of the same size as the third. A 
