We approached the wall to the west, as a path went through the harsh swamp herbage that way, and entered the jungle. The sun went out almost at once. It was cellar cool under the trees. We had no idea where the path would lead us. That did not matter. No doubt it would be the place desired. The Doctor walked ahead, and I could just see his helmet, the way was so narrow and uncertain. I kept missing the helmet, for everything in the half-lighted solitude was strange. One could not keep an eye on a white hat on one's first equatorial ramble, and only when the quiet was heavy enough to be a burden did I look up from a puzzling leaf, or some busy ants, to find myself alone. There was a feeling that you were being watched; but there were no eyes, when you glanced round quickly. Do you remember that dream which sometimes came when we were children? There were, I remember, empty corridors prolonging into the shadows of a nameless house where not a sign showed of what was there. We went on, and no words we could think of when we woke could tell what we felt when we looked into those long silent aisles of the house without a name; for we knew something was there; but there was no telling what the thing would be like when it showed. That is your sensation in a first walk in a Brazilian forest.
I stopped at lianas, and curious foliage, trying to trace them to a beginning, but rarely with any success. There were some mantis, which commenced to run on a tree while I was examining its bark. They were like flakes of the bark. For a moment the tree seemed to quiver its hide at my irritating touch. Then the Doctor called, and I pushed along to find him stooping over a land snail, the size of a man's fist, which rather puzzled him, for it had what he called an operculum; that is, a cap such as a winkle's, only in this case it was as large as a crown piece. I do not know if it was the operculum, for my knowledge of such things is small; but I did feel this was the only twelfth birthday which had come to me for many years.
Presently we saw light, as you would from the interior of a tunnel. Some beams of sunshine slanted from a break in the roof to where a tree had fallen, making a bridge for us across an igaripe, a stream, that is, large enough to be a way for a canoe. The sundered, buttressed roots of the tree formed a steep climb to begin with, but the buttresses going straight along the trunk as handrails made crossing the bridge an easy matter. Raising my hand to a root which was hot in the sun, and watching a helicon butterfly, a black and yellow fellow, which settled near us, slowly open and shut his wings, I jumped, because it felt as though a lighted match had dropped into my sleeve. But I couldn't douse it. It burned in ten places at once. It was a first lesson in constant watchfulness in this new world. I had placed my hand in a swarm of inconspicuous fire ants. The dead tree was alive with them, and our passage quickened. We rubbed ourselves hysterically, for the Doctor had got some too; and there was no professional reserve about him that time.