Before putting the letter away, however, he handed it back, telling me to place it against my forehead for a few moments and then describe any pictures that came spontaneously into my mind.

“Don’t deliberately look for anything. Just imagine you see the inside of the eyelid, and wait for pictures that rise against its dark screen.”

I followed his instructions, making my mind as nearly blank as possible. But no visions came. I saw nothing but the lines of light that pass to and fro like the changes of a kaleidoscope across the blackness. A momentary sensation of warmth came and went curiously.

“You see⁠—what?” he asked presently.

“Nothing,” I was obliged to admit disappointedly; “nothing but the usual flashes of light one always sees. Only, perhaps, they are more vivid than usual.”

He said nothing by way of comment or reply.