mr ATTRACTING QUEENS 113 
having been previously lifted off, so that any loose 
earth that might drop into the tunnel could be seen 
and removed. Finally the nest was placed inside 
the tin, the tin closed, and a board placed on the 
surface of the ground over the spot. 
Rust soon caused the lids to stick to the cylinders, 
so I had to substitute lids of a larger size. To pre- 
vent ants and other vermin from getting into the 
nest-cavity through the joint round the lid, I placed 
a sheet of felt between the lid and the cylinder. 
AE 
i 

FIG. 24.—Vertical Section of Sladen’s Tin Domicile. 
c, Tin cylinder ; Z, tin lid; /, felt. 
The first eight tin domiciles were put down on 
May 23. Unfortunately these were provided with 
small flat holes, 2 in. by 13 in., some of which must 
have got choked very soon, probably by worms 
travelling across them; nevertheless, two of them 
were occupied by queens, both being /apzdarius. 
Seven more tin domiciles were put down on 
May 27 with round holes 1} in. wide. Every one 
of these became tenanted, six by /agzdarzus queens 
and one by a datvezlle//us queen. 
Finally, four more were put down on May 30 
with 1} in. holes. Two of these became wet after 
I 
