SIR J. LUBBOCK OK ANTS, BEES, AND WASPS. 



181 



several pillars of earth are left, almost as if to support the roof. 

 Behind the main chamber is an inner sanctum divided into three 

 chambers, and to which access is obtained through narrow en- 

 trances (f,f,f,f). Most of the pillars in the main chamber are 

 irregular in outline, but two of them (g, g) were regular ovals, 



Fig. 5. 



Ground-plan of a typical nest of Lasius niger, reduced, a, narrow doorway ; 

 b, widening beyond entrance ; c, vestibule; d, main chamber ; e, inner sanctum ; 

 /> /> f> f> narrow entrance passages to sanctum ; g, g, special pillars. 



and round each, for a distance about as long as the body of an ant, 

 the glass had been most carefully cleaned. This was so marked, 

 and the edge of the cleaned portion was so distinct that it is im- 



