"'Eh?' I stammered, 'disturbed at night? Oh no, thanks, at least, not that I know of—'
"'I'm glad,' he replied gravely, appearing not to notice my confusion and surprise at his question. 'But, remember, should it ever be the case, please let me know at once.'
"And he was gone down the stairs and into his room again.
"For some minutes I sat reflecting upon his strange behaviour. He was not mad, I argued, but was the victim of some harmless delusion that had gradually grown upon him as a result of his solitary mode of life; and from the books he used, I judged that it had something to do with mediæval magic, or some system of ancient Hebrew mysticism. The words he asked me to pronounce for him were probably 'Words of Power,' which, when uttered with the vehemence of a strong will behind them, were supposed to produce physical results, or set up vibrations in one's own inner being that had the effect of a partial lifting of the veil.
"I sat thinking about the man, and his way of living, and the probable effects in the long-run of his dangerous experiments, and I can recall perfectly well the sensation of disappointment that crept over me when I realised that I had labelled his particular form of aberration, and that my curiosity would therefore no longer be excited.
"For some time I had been sitting alone with these reflections—it may have been ten minutes or it may have been half an hour—when I was aroused from my reverie by the knowledge that someone was again in the room standing close beside my chair. My first thought was that Smith had come back again in his swift, unaccountable manner, but almost at the same moment I realised that this could not be the case at all. For the door faced my position, and it certainly had not been opened again.
"Yet, someone was in the room, moving cautiously to and fro, watching me, almost touching me. I was as sure of it as I was of myself, and though at the moment I do not think I was actually afraid, I am bound to admit that a certain weakness came over me and that I felt that strange disinclination for action which is probably the beginning of the horrible paralysis of real terror. I should have been glad to hide myself, if that had been possible, to cower into a corner, or behind a door, or anywhere so that I could not be watched and observed.
"But, overcoming my nervousness with an effort of the will, I got up quickly out of my chair and held the reading lamp aloft so that it shone into all the corners like a searchlight.
"The room was utterly empty! It was utterly empty, at least, to the eye, but to the nerves, and especially to that combination of sense perception which is made up by all the senses acting together, and by no one in particular, there was a person standing there at my very elbow.
"I say 'person,' for I can think of no appropriate word. For, if it was a human being, I can only affirm that I had the overwhelming conviction that it was not, but that it was some form of life wholly unknown to me both as to its essence and its nature. A sensation of gigantic force and power came with it, and I remember vividly to this day my terror on realising that I was close to an invisible being who could crush me as easily as I could crush a fly, and who could see my every movement while itself remaining invisible.