respond to an increased rate of vibration.
And, let me tell you, Mr. Pender, that your experiment might have had
results far more dire. It has brought you into touch with a somewhat
singular class of Invisible, but of one, I think, chiefly human in
character. You might, however, just as easily have been drawn out of
human range altogether, and the results of such a contingency would
have been exceedingly terrible. Indeed, you would not now be here to
tell the tale. I need not alarm you on that score, but mention it as a
warning you will not misunderstand or underrate after what you have been
through.

"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