The majority still moved in one direction, and I found it led to the heap of rubbish over which they swarmed. This heap was exactly what might have been swept together by half-a-dozen men using long gardeners' brooms, and industriously clearing the ground under the firs of the fragments which had fallen from them. It appeared to be entirely composed of small twigs, fir-needles, dead leaves, and similar things. The highest part rose about level with my chest--say, between four and five feet--the heap was irregularly circular, and not less than three or four yards across, with sides gradually sloping. In the midst stood the sapling birches, their stumps buried in it, the rubbish having been piled up around them. This heap was, in fact, the enormous nest or hill of a colony of horse ants. The whole of it had been gathered together, leaf by leaf, and twig by twig, just as I had seen the two insects carrying the little stick, and the third the brown leaf above itself. It really seemed some way round the outer circumference of the nest, and while walking round it was necessary to keep brushing off the ants which dropped on the shoulder from the branches of the birches. For they were everywhere; every inch of ground, every bough was covered with them. Even standing near it was needful to kick the feet continually against the black stump of a fir which had been felled to jar them off, and this again brought still more, attracted by the vibration of the ground. The highest part of the mound was in the shape of a dome, a dome whitened by layers of fir-needles, which was apparently the most recent part and the centre of this year's operations. The mass of the heap, though closely compacted, was fibrous, and a stick could be easily thrust into it, exposing the eggs. No sooner was such an opening made, and the stick withdrawn from the gap, than the ants swarmed into it, falling headlong over upon each other, and filling the bottom with their struggling bodies. Upon leaving the spot, to follow the footpath, I stamped my feet to shake down any stray insects, and then took off my coat and gave it a thorough shaking.