I said, you will remember, that the ground I was on was a sort of flat terrace at the top of a steep slope. Now at one end this terrace just went down into the wood, but at the other end there was a little mound or hillock with thick underwood behind it. I felt a curiosity, an inclination, to walk that way: I have very little doubt that the plant was at the bottom of it. As I walked I looked at the ground, and noticed a curious thing: the roots of the plants and grasses seemed to show more than I was accustomed to see them. It was not a great way to the hillock. When I got to it I wondered why I had gone, for there was nothing odd about it. Still I stepped on to the top, and then I did see something, namely, a square flat stone just in front of my feet. I poked at it with my walking-stick, but somehow I did not seem to touch it, nor was there any scraping noise. This was funny. I tried again, and now I saw that my stick was not touching it at all; there was something in between. I felt with my hands, and they met with what seemed like grass and earth, certainly not like stone. _Then_ I understood. The plant was the one which makes you able to see what is under the ground! I need not tell you all I thought, or how surprising and delightful it was. The first thing was to get at the flat stone and find out what was underneath it. Accordingly, what with a knife and what with my fingers, I soon had it uncovered: it was four or five inches under the surface. There were no marks on it; it measured more than a foot each way. I lifted it. It was the cover of a sort of box with bottom and sides each made of a slab just like the lid. In this box was another, made of some dark metal, which I took to be lead. I pulled it out and found that the lid of the box was all of one piece with the rest, like a sardine tin. Evidently I could not open it there and then. It was rather heavy, but I did not care, and I managed without too much inconvenience to carry it home to the place I was lodging in. Of course I put back the stone neatly and covered it up with earth and grass again. I was late for tea, but I had found what was better than tea. II THE FIRST JAR