additions to our knowledge of evolution. Now I don't propose to
bore you with the details of the tests, but one of the things
they showed was that the blood of a certain branch of the human
race gives a reaction much like the blood of a certain group of
monkeys, the chimpanzees, while the blood of another branch gives
a reaction like that of the gorilla. Of course there's lots more
to it, but this is all that need concern us now.

"I tried the tests. The blood on the handkerchief conformed
strictly to the latter test. Now the gorilla was, of course, out
of the question--this was no Rue Morgue murder. Therefore it was
the negro waiter."

"But," I interrupted, "the negro offered a perfect alibi at the
start, and--"

"No buts, Walter. Here's a telegram I received at dinner:
'Congratulations. Confronted Jackson your evidence as wired.
Confessed.'"

"Well, Craig, I take off my hat to you," I exclaimed. "Next
you'll be solving this Kerr Parker case for sure."

"I would take a hand in it if they'd let me," said he simply.

That night, without saying anything, I sauntered down to the
imposing new police building amid the squalor of Center Street.
They were very busy at headquarters, but, having once had that
assignment for the Star, I had no trouble in getting in.
Inspector Barney O'Connor of the Central Office carefully shifted