exercised."

"Possibly. He told me of the strength of his evil impulses, of how he
hated their assaults, and of how being with me enabled him to conquer
them. Apparently the contemplation of my unnatural nature is an armour
to him."

"It is."

"Well, I continued to bewail my condition, which he envied, and it ended
in our sitting down, in jest, to make an experiment to try to exchange
our souls."

"What means did you take?"

And then Valentine told Dr. Levillier the exact circumstances of the
three sittings, without embellishment, without omission of any kind.
He listened with keen attention, and without attempting interruption
or intruding comment. When Valentine had finished he made no remark.

"What do you think of it, doctor?"

"Of what part of it?"

"Of any part. Do you attach any importance to it?"

"I do, certainly."

"I thought you would laugh at the whole thing."