How I Found Livingstone

I imagine that these ant-hills were formed during a remarkably wet season, when, possibly, the forest-clad plain was inundated. I have seen the ants at work by thousands, engaged in the work of erecting their hills in other districts suffering from inundation. What a wonderful system of cells these tiny insects construct! A perfect labyrinth--cell within cell, room within room, hall within hall--an exhibition of engineering talents and high architectural capacity--a model city, cunningly contrived for safety and comfort!