n carried that ball home with him."

Then I suggested that near the end of the game it might have jumped off
the table, and I looked carefully under the furniture and in the various
corners, but without success. There was another set of balls, and out of
it I selected a white one for our play, and the game began. It went
along in the usual way, the balls constantly falling into the pockets,
and as constantly being replaced on the table. This had continued for
perhaps half an hour, there being no pocket that had not been frequently
occupied and emptied during that time; but then it happened that Clemens
reached into the middle pocket, and taking out a white ball laid it in
place, whereupon we made the discovery that three white balls lay upon
the table. The one just taken from the pocket was the missing ball. We
looked at each other, both at first too astonished to say anything at
all. No one had been in the room since we began to play, and at no time
during the play had there been more than two white balls in evidence,
though the pockets had been emptied at the end of each shot. The pocket
from which the missing ball had been taken had been filled and emptied
again and again. Then Clemens said:

"We must be dreaming."

We stopped the game for a while to discuss it, but we could devise no
material explanation. I suggested the kobold--that mischievous invisible
which is supposed to play pranks by carrying off such things as pencils,
letters, and the like, and suddenly restoring them almost before one's
eyes. Clemens, who, in spite of his material logic, was always a mystic
at heart, said:

"But that, so far as I know, has never happened to more than one person
at a time, and has been explained by a sort of temporary mental
blindness. This thing has happened to two of us, and there can be no
question as to the positive absence of the object."

"How about dematerialization?"

"Yes, if one of us were a medium that might be considered an
explanation."

He went on to recall that Sir Alfred Russel Wallace had written of such
things, and cited instances which Wallace had recorded. In the end he
said:

"Well, it happened, that's all we can say, and nobody can ever convince
me that it didn't."

We went on playing, and the ball remained solid and substantial ever
after, so far as I know.

I am reminded of two more or less related incidents of this period.
Clemens was, one morning, dictating something about his Christia