ABIDING CITIES 



181 



it lies a second layer, six inches thick, composed 

 entirely of roots of heather and rootlets of fir-trees, 

 all carefully stripped clean of bark, and making a 

 dry foundation for the warm hillock of pine-needles. 



NO. 2. A WOOD ANTS* NEST, INTERIOR ; EGGS, GRUBS, AND 

 COCOONS, WITH WORKERS ENGAGED IN TENDING THEM. 



Below this woody layer, again, the ground is tun- 

 nelled to an unknown depth by long subterranean 

 galleries, driven right through a stratum of solid 

 sandstone. These inner galleries extend not only 



