t the vehicle set out at a smart pace up Broadway,
turning presently into Fifth Avenue, and proceeding northward again. It
was with a rapidly beating heart that I accompanied this wonderful and
gifted assassin, whose analytical genius and superb self-confidence had
prompted him to make me the tremendous promise of bringing me into the
presence of a murderer and the New York detective in pursuit of him
simultaneously. Even yet I could not believe it possible.

"Are you sure that you are not being led into some trap?" I asked.
"Suppose that your clue, whatever it is, should bring us only into the
presence of the Commissioner of Police and a couple of dozen cops!"

"My dear doctor," said Knight, a little stiffly. "I would remind you
that I am no gambler."

"I beg your pardon," said I. "But I do not think you will find Jolnes."

The cab stopped before one of the handsomest residences on the avenue.
Walking up and down in front of the house was a man with long red
whiskers, with a detective's badge showing on the lapel of his coat.
Now and then the man would remove his whiskers to wipe his face, and
then I would recognize at once the well-known features of the great New
York detective. Jolnes was keeping a sharp watch upon the doors and
windows of the house.

"Well, doctor," said Knight, unable to repress a note of triumph in his
voice, "have you seen?"

"It is wonderful--wonderful!" I could not help exclaiming as our cab
started on its return trip. "But how did you do it? By what process
of induction--"

"My dear doctor," interrupted the great murderer, "the inductive theory
is what the detectives use. My process is more modern. I call it the
saltatorial theory. Without bothering with the tedious mental
phenomena necessary to the solution of a mystery from slight clues, I
jump at once to a conclusion. I will explain to you the method I
employed in this case.

"In the first place, I argued that as the crime was committed in New
York City in broad daylight, in a public place and under peculiarly
atrocious circumstances, and that as the most skilful sleuth available
was let loose upon the case, the perpetrator would never be discovered.
Do you not think my postulation justified by precedent?"

"Perhaps so," I replied, doggedly. "But if Big Bill Dev--"

"Stop that," interrupted Knight, with a smile, "I've heard that several
times. It's too late now. I will proceed.

"If homicides in New York went undisc