Then suddenly he pointed at the wall just behind my chair, and his voice cracked as he spoke.

‘Look, what’s that?’ he said. ‘There on the wall.’

Considerably startled I turned in the direction of his shaking finger. The wall was pale grey in tone, and sharp-cut against it was a shadow that, as I looked, moved. It was like the shadow of some enormous slug, legless and fat, some two feet high by about four feet long. Only at one end of it was a head shaped like the head of a seal, with open mouth and panting tongue.

Then even as I looked it faded, and from somewhere close at hand there sounded another of those shattering knocks.

For a moment after there was silence between us, and horror was thick as snow in the air. But, somehow neither Louis or I were frightened for more than one moment. The whole thing was so absorbingly interesting.

‘That’s what I mean by its being outside my control,’ he said. ‘I said I was ready for any—any visitor to come in, and by God, we’ve got a beauty.’

Now I was still, even in spite of the appearance of this shadow, quite convinced that I was only taking observations of a most curious case of disordered brain accompanied by the most vivid and remarkable thought-transference. I believed that I had not seen a slug-like shadow at all, but that Louis had visualised this dreadful creature so intensely that I saw what he saw. I found also that his spiritualistic trash-books which I thought a truer nomenclature than text-books, mentioned this as a common form for Elementals to take. He on the other hand was more firmly convinced than ever that we were dealing not with a subjective but an objective phenomenon.

For the next six months or so we sat constantly, but made no further progress, nor did the Thing or its shadow appear again, and I began to feel that we were really wasting time. Then it occurred to me, to get in a so-called medium, induce hypnotic sleep, and see if we could learn anything further. This we did, sitting as before round the dining-room table. The room was not quite dark, and I could see sufficiently clearly what happened.

The medium, a young man, sat between Louis and myself, and without the slightest difficulty I put him into a light hypnotic sleep. Instantly there came a series of the most terrific raps, and across the table there slid something more palpable than a shadow, with a faint luminance about it, as if the surface of it was smouldering. At the moment the medium’s face became contorted to a mask of hellish terror; mouth and eyes were both open, and the eyes were focussed on something close to him. The Thing waving its head came closer and closer to him, and reached out towards his throat. Then with a yell of panic, and warding off this horror with his hands, the medium sprang up, but It had already caught hold, and for the moment he could not get free. Then simultaneously Louis and I went to his aid, and my hands touched something cold and slimy. But pull as we could we could not get it away. There was no firm hand-hold to be taken; it was as if one tried to grasp slimy fur, and the touch of it was horrible, unclean, like a leper. Then, in a sort of despair, though I still could not believe that the horror was real, for it must be a vision of diseased imagination, I remembered that the switch of the four electric lights was close to my hand. I turned them all on. There on the floor lay the medium, Louis was kneeling by him with a face of wet paper, but there was nothing else there. Only the collar of the medium was crumpled and torn, and on his throat were two scratches that bled.

The medium was still in hypnotic sleep, and I woke him. He felt at his collar, put his hand to his throat and found it bleeding, but, as I expected, knew nothing whatever of what had passed. We told him that there had been an unusual manifestation, and he had, while in sleep, wrestled with something. We had got the result we wished for, and were much obliged to him.