reasoner follows the unspoken thoughts of his companion, you were
inclined to treat the matter as a mere tour-de-force of the
author. On my remarking that I was constantly in the habit of
doing the same thing you expressed incredulity."

"Oh, no!"

"Perhaps not with your tongue, my dear Watson, but certainly with
your eyebrows. So when I saw you throw down your paper and enter
upon a train of thought, I was very happy to have the opportunity
of reading it off, and eventually of breaking into it, as a proof
that I had been in rapport with you."

But I was still far from satisfied. "In the example which you
read to me," said I, "the reasoner drew his conclusions from the
actions of the man whom he observed. If I remember right, he
stumbled over a heap of stones, looked up at the stars, and so
on. But I have been seated quietly in my chair, and what clues
can I have given you?"

"You do yourself an injustice. The features are given to man as
the means by which he shall express his emotions, and yours are
faithful servants."

"Do you mean to say that you read my train of thoughts from my
features?"

"Your features and especially your eyes. Perhaps you cannot
yourself recall how your reverie commenced?"