We passed very slowly through the woods, partly because Lord Roxton acted as scout before he would let us advance, and partly because at every second step one or other of our professors would fall, with a cry of wonder, before some flower or insect which presented him with a new type. We may have traveled two or three miles in all, keeping to the right of the line of the stream, when we came upon a considerable opening in the trees. A belt of brushwood led up to a tangle of rocks—the whole plateau was strewn with boulders. We were walking slowly towards these rocks, among bushes which reached over our waists, when we became aware of a strange low gabbling and whistling sound, which filled the air with a constant clamor and appeared to come from some spot immediately before us. Lord John held up his hand as a signal for us to stop, and he made his way swiftly, stooping and running, to the line of rocks. We saw him peep over them and give a gesture of amazement. Then he stood staring as if forgetting us, so utterly entranced was he by what he saw. Finally he waved us to come on, holding up his hand as a signal for caution. His whole bearing made me feel that something wonderful but dangerous lay before us.
Creeping to his side, we looked over the rocks. The place into which we gazed was a pit, and may, in the early days, have been one of the smaller volcanic blowholes of the plateau. It was bowl-shaped and at the bottom, some hundreds of yards from where we lay, were pools of green-scummed, stagnant water, fringed with bullrushes. It was a weird place in itself, but its occupants made it seem like a scene from the Seven Circles of Dante. The place was a rookery of pterodactyls. There were hundreds of them congregated within view. All the bottom area round the water-edge was alive with their young ones, and with hideous mothers brooding upon their leathery, yellowish eggs. From this crawling flapping mass of obscene reptilian life came the shocking clamor which filled the