succession of blurs. The blurring sensation makes my eyes ache and my
brain tired."

"Have you any other warnings of my presence?" he asked.

"No, and yes," I answered. "When you are near me I have feelings similar
to those produced by dank warehouses, gloomy crypts, and deep mines. And
as sailors feel the loom of the land on dark nights, so I think I feel
the loom of your body. But it is all very vague and intangible."

Long we talked that last morning in his laboratory; and when I turned to
go, he put his unseen hand in mine with nervous grip, and said, "Now
I shall conquer the world!" And I could not dare to tell him of Paul
Tichlorne's equal success.

At home I found a note from Paul, asking me to come up immediately, and
it was high noon when I came spinning up the driveway on my wheel. Paul
called me from the tennis court, and I dismounted and went over. But the
court was empty. As I stood there, gaping open-mouthed, a tennis ball
struck me on the arm, and as I turned about, another whizzed past my
ear. For aught I could see of my assailant, they came whirling at me
from out of space, and right well was I peppered with them. But when
the balls already flung at me began to come back for a second whack, I
realized the situation. Seizing a racquet and keeping my eyes open, I
quickly saw a rainbow flash appearing and disappearing and darting over
the ground. I took out after it, and when I laid the racquet upon it for
a half-dozen stout blows, Paul's voice rang out:

"Enough! Enough! Oh! Ouch! Stop! You're landing on my naked skin, you
know! Ow! O-w-w! I'll be good! I'll be good! I only wanted you to see
my metamorphosis," he said ruefully, and I imagined he was rubbing his
hurts.

A few minutes later we were playing tennis--a handicap on my part, for I
could have no knowledge of his position save when all the angles between
himself, the sun, and me, were in proper conjunction. Then he
flashed, and only then. But the flashes were more brilliant than the
rainbow--purest blue, most delicate violet, brightest yellow, and all
the intermediary shades, with the scintillant brilliancy of the diamond,
dazzling, blinding, iridescent.

But in the midst of our play I felt a sudden cold chill, reminding me
of deep mines and gloomy crypts, such a chill as I had experienced that
very morning. The next moment, close to the net, I saw a ball rebound in
mid-air and empty space, and at the same instant, a score of feet away,