Within this confined space a certain number of creatures, mostly types which have passed away in the world below, have lived together for innumerable years. Now, it is very clear to me that in so long a period one would have expected that the carnivorous creatures, multiplying unchecked, would have exhausted their food supply and have been compelled to either modify their flesh-eating habits or die of hunger. This we see has not been so. We can only imagine, therefore, that the balance of Nature is preserved by some check which limits the numbers of these ferocious creatures. One of the many interesting problems, therefore, which await our solution is to discover what that check may be and how it operates. I venture to trust that we may have some future opportunity for the closer study of the carnivorous dinosaurs."
"And I venture to trust we may not," I observed.
The Professor only raised his great eyebrows, as the schoolmaster meets the irrelevant observation of the naughty boy.
"Perhaps Professor Summerlee may have an observation to make," he said, and the two savants ascended together into some rarefied scientific atmosphere, where the possibilities of a modification of the birth-rate were weighed against the decline of the food supply as a check in the struggle for existence.
That morning we mapped out a small portion of the plateau, avoiding the swamp of the pterodactyls, and keeping to the east of our brook instead of to the west. In that direction the country was still thickly wooded, with so much undergrowth that our progress was very slow.
I have dwelt up to now upon the terrors of Maple White Land; but there was another side to the subject, for all that morning we wandered among lovely flowers--mostly, as I observed, white or yellow in color, these being, as our professors explained, the primitive flower-shades. In many places the ground was absolutely covered with them, and as we walked ankle-deep on that wonderful yielding carpet, the scent was almost intoxicating in its sweetness and intensity. The homely English bee buzzed everywhere around us. Many of the trees under which we passed had their branches bowed down with fruit, some of which were of familiar sorts, while other varieties were new. By observing which of them were pecked by the birds we avoided all danger of poison and added a delicious variety to our food reserve. In the jungle which we traversed were numerous hard-trodden paths made by the wild beasts, and in the more marshy places we saw a profusion of strange footmarks, including many of the iguanodon. Once in a grove we observed several of these great creatures grazing, and Lord John, with his glass, was able to report that they also were spotted with asphalt, though in a different place to the one which we had examined in the morning. What this phenomenon meant we could not imagine.
We saw many small animals, such as porcupines, a scaly ant-eater, and a wild pig, piebald in color and with long curved tusks. Once, through a break in the trees, we saw a clear shoulder of green hill some distance away, and across this a large dun-colored animal was traveling at a considerable pace. It passed so swiftly that we were unable to say what it was; but if it were a deer, as was claimed by Lord John, it must have been as large as those monstrous Irish elk which are still dug up from time to time in the bogs of my native land.
Ever since the mysterious visit which had been paid to our camp we always returned to it with some misgivings. However, on this occasion we found everything in order.
That evening we had a grand discussion upon our present situation and future plans, which I must describe at some length, as it led to a new departure by which we were enabled to gain a more complete knowledge of Maple White Land than might have come in many weeks of exploring. It was Summerlee who opened the debate. All day he had been querulous in manner, and now some remark of Lord John's as to what we should do on the morrow brought all his bitterness to a head.