We entered the laboratory in the attic, and I observed that detestable electrical machine, glowing with a sickly, sinister, violet luminosity. It was connected with a powerful chemical battery, but seemed to be receiving no current; for I recalled that in its experimental stage it had sputtered and purred when in action. In reply to my question Tillinghast mumbled that this permanent glow was not electrical in any sense that I could understand.

He now seated me near the machine, so that it was on my right, and turned a switch somewhere below the crowning cluster of glass bulbs. The usual sputtering began, turned to a whine, and terminated in a drone so soft as to suggest a return to silence. Meanwhile the luminosity increased, waned again, then assumed a pale, outré colour or blend of colours which I could neither place nor describe.

Tillinghast had been watching me, and noted my puzzled expression.

“Do you know what that is?” he whispered. “That is ultra-violet.” He chuckled oddly at my surprise. “You thought ultra-violet was invisible, and so it is—but you can see that and many other invisible things now.

“Listen to me! The waves from that thing are waking a thousand sleeping senses in us; senses which we inherit from aeons of evolution from the state of detached electrons to the state of organic humanity. I have seen truth, and I intend to show it to you. Do you wonder how it will seem? I will tell you.” Here Tillinghast seated himself directly opposite me, blowing out his candle and staring hideously into my eyes. “Your existing sense-organs—ears first, I think—will pick up many of the impressions, for they are closely connected with the dormant organs. Then there will be others. You have heard of the pineal gland? I laugh at the shallow endocrinologist, fellow-dupe and fellow-parvenu of the Freudian. That gland is the great sense-organ of organs—I have found out. It is like sight in the end, and transmits visual pictures to the brain. If you are normal, that is the way you ought to get most of it . . . I mean get most of the evidence from beyond.”