BUCKINGHAM. 



DIVISION OF LABOR AMONG ANTS. 



459 



(b) Vertical nest. The second kind of nest (Figures 15-17) was ver- 

 tical, and consisted of a plaster-of-l'aris base, two end pieces of wood let 

 into two sockets (Figure 16, d) in the base, two sides of glass, and a 

 wooden cover. The base (Figure 16) was 6^ inches long, 2\ inches 

 wide, and | inch thick. The thickness of the base was increased above 

 the level sX a \\ inches at the ends (c) and along the middle of its 



i.-^ 



Figure 17. 



upper surface {h). In each end thickening (c) there was a groove, or 

 elongated mortise {d), which received the tenon {e, Figure 17) of the 

 lower end of the wooden end piece. In the upper end of each of these 

 pieces was inserted a cylindrical glass peg, / (Figure 1 7), to hold in place 

 the wooden cover, k, which had bored in it holes corresponding in size 

 to the peg and in such positions as to hold the end pieces parallel to 

 each other. The end pieces were 5^ inches long, 1^ inches wide and 

 I J inch thick. To the inner surface of each was securely fastened a 

 strip of wood {J) y\ inch thick and as wide (^ inch) as the median 

 thickening {h) of the base. This strip of wood and the thickening {h) 

 of the base served as stops to keep apart the two glass plates {i, Fig- 



