Courtney hesitated.

"Well, I suppose there must be," he said at last. "I'm not a
church-goer, and I'm rather a free-thinker, but I certainly
believe there is a Mind at work behind the Matter."

"That being the case," proceeded the Doctor, "I suppose you will
not deny to this Invisible Mind the same exactitude of proportion
and precise method of action already granted to Visible Matter?".

"Of course, I could not deny such a reasonable proposition," said
Courtney.

"Very good! Pursuing the argument logically, and allowing for an
exactly-moving Mind behind exactly-working Matter, it follows that
there can be no such thing as injustice anywhere in the universe?
"

"My dear Socrates redivivus," laughed Courtney, "I fail to see
what all this has to do with ghosts."

"It has everything to do with them," declared the Doctor
emphatically, "I repeat that if we grant these already stated
premises concerning the composition of Mind and Matter, there can
be no such thing as injustice. Yet seemingly unjust things are
done every day, and seemingly go unpunished. I say 'seemingly'
advisedly, because the punishment is always administered. And here
the 'scientific ghosts' come in. 'Vengeance is mine,' saith the
Lord,--and the ghosts I speak of are the Lord's way of doing it."