ty of
one animal has been taken out and put into the other."

She was unable to speak. He had mentioned madness: was he, Professor
Ramsey Burr, crazy? It was likely enough. Yet--yet the whole thing, in
these surroundings, seemed plausible. As she hesitated about speaking,
watching with fascinated eyes the out-of-character behavior of the two
beasts, Burr went on.

"The second part follows at once. Now that the two egos have
interchanged, I will shift the bodies. When it is completed, the monkey
will have taken the place of the cat, and vice versa. Watch."

He was busy for some time with his levers, and the smell of ozone
reached Mrs. Baker's nostrils as she stared with horrified eyes at the
animals.

She blinked. The sparks crackled madly, the monkey mewed, the cat
chattered.

Were her eyes going back on her? She could see neither animal
distinctly: they seemed to be shaking in some cosmic disturbance, and
were but blurs. This illusion--for to her, it seemed it must be
optical--persisted, grew worse, until the quaking forms of the two
unfortunate creatures were like so much ectoplasm in swift motion,
ghosts whirling about in a dark room.

Yet she could see the cages quite distinctly, and the table and even the
indicators of the scales. She closed her eyes for a moment. The acrid
odors penetrated to her lungs, and she coughed, opening her eyes.

* * * * *

Now she could see clearly again. Yes, she could see a monkey, and it was
climbing, quite naturally about its cage; it was excited, but a monkey.
And the cat, while protesting mightily, acted like a cat.

Then she gasped. Had her mind, in the excitement, betrayed her? She
looked at Professor Burr. On his lean face there was a smile of triumph,
and he seemed to be awaiting her applause.

She looked again at the two cages. Surely, at first the cat had been in
the right-hand cage, and the monkey in the left! And now, the monkey was
in the place where the cat had been and the cat had been shifted to the
left-hand cage.

"So it was with Smith, when the alloys burned out," said Burr. "It is
impossible to extract the ego or dissolve the atoms and translate them
into radio waves unless there is a connection with some other ego and
body, for in such a case the translated soul and body would have no
place to go. Luckily, for you, madam, it was the man Smith who was
killed when the alloys failed me. It might have been Allen, for he was