“You look puzzled. You do not quite gather what I am driving at; and it is not to be expected that you should, for you, I suppose, are the nominal Christian with the nominal Christian’s lofty standard of ethics, and his utter ignorance of spiritual possibilities. Beyond a somewhat childish understanding of ‘spiritual wickedness in high places,’ you probably have no conception of what is possible once you break down the slender gulf that is mercifully fixed between you and that Outer World. But my studies and training have taken me far outside these orthodox trips, and I have made experiments that I could scarcely speak to you about in language that would be intelligible to you.”

He paused a moment to note the breathless interest of Pender’s face and manner. Every word he uttered was calculated; he knew exactly the value and effect of the emotions he desired to waken in the heart of the afflicted being before him.

“And from certain knowledge I have gained through various experiences,” he continued calmly, “I can diagnose your case as I said before to be one of psychical invasion.”

“And the nature of this—er—invasion?” stammered the bewildered writer of humorous tales.

“There is no reason why I should not say at once that I do not yet quite know,” replied Dr. Silence. “I may first have to make one or two experiments——”

“On me?” gasped Pender, catching his breath.

“Not exactly,” the doctor said, with a grave smile, “but with your assistance, perhaps. I shall want to test the conditions of the house—to ascertain, if possible, the character of the forces, of this strange personality that has been haunting you——”

“At present you have no idea exactly who—what—why——” asked the other in a wild flurry of interest, dread and amazement.

“I have a very good idea, but no proof rather,” returned the doctor. “The effects of the drug in altering the scale of time and space, and merging the senses have nothing primarily to do with the invasion. They come to any one who is fool enough to take an experimental dose. It is the other features of your case that are unusual. You see, you are now in touch with certain violent emotions, desires, purposes, still active in this house, that were produced in the past by some powerful and evil personality that lived here. How long ago, or why they still persist so forcibly, I cannot positively say. But I should judge that they are merely forces acting automatically with the momentum of their terrific original impetus.”

“Not directed by a living being, a conscious will, you mean?”