1. On a remote spot in a very rough and rugged locality, hemmed in by immense blocks of granite, is a large incubating mound. Save at one point it is encompassed by rocks, but the opening does not grant facilities for the accumulation of vegetable debris, yet the mound continually increases in dimensions. At first glance there seems no means by which such a large heap could have been accumulated for the birds do not carry their materials, but kick and scratch them to the site. A hasty survey shows that the birds have taken advantage of the junction of two impending rocks which form a fortuitous shoot down which to send the rubbish with the least possible exertion on their part. The shoot is always in use, for the efficacy of the mound depends upon the heat generated by actually decaying vegetation. Did the birds think out this simple labour-saving method before deciding on the site for the mound, or was it a gracious afterthought--one of those automatic impulses by which Nature confronts difficulties? 2. As I wandered on the hilltops far from home I was astonished when Tom, the cutest of black boys, dropped on his knees to investigate a crevice between two horizontal slabs of granite filled with dead leaves and loam. The spot, bare of grass, was about twenty yards from the edge of a fairly thick, low-growing scrub where scrub fowls are plentiful. I was inclined to smile when he said, "Might be hegg belonga scrub hen sit down!" He scooped out some of the rubbish--the crevice was so narrow that it barely admitted his arm--and finally dug a hole with his fingers fully fourteen inches deep, revealing an egg, pink with freshness. A more unlikely spot for a scrub fowl to lay, could hardly be imagined. There was no mound, the crevice being merely filled flush, and the vegetable rubbish packed between the flat rocks did not appear to be sufficient in quantity to generate in its decay the temperature necessary to bring about incubation. Yet the egg was warm, and upon reflecting that the sun's rays keep the granite slabs in the locality hot during the day, so hot, indeed, that there is no sitting down on them with comfort, I perceived that here was evidence on which to maintain an argument of rare sagacity on the part of the bird, and that the hypothesis might be thus stated: This cool-footed cultivator of the jungle floor had during the casual rambling on sunlit spaces become conscious of the heat of the rocks. Being impressed, she surveyed the locality, and of her deliberate purpose selected a spot for the completion of her next ensuing maternal duties which, while it scandalised the traditions of her tribe, presented unrealised facilities.