He gives not a single proof of his identity.

I horsewhipped him on the night of your birthday for insulting a lady, and--" "What lady ?" asked Roger.
"Miss Oliphant," said the tutor, flushing a little.

"He then, as a desperate expedient for getting off the punishment he deserved, blurted out this preposterous story.

And having once published it, it appears he means to make capital out of it.

Roger, old fellow, you are no fool." "I am fool enough to believe there is something in the story," said Roger; "at any rate I must follow it up.