ps," he suggested, "what caused the
mysterious light? I could have told you this morning, but I fear I was
in a bad temper, Petrie. It's very simple; a length of tape soaked in
spirit or something of the kind, and sheltered from the view of any
one watching from your windows, behind the trunk of the tree; then,
the end ignited, lowered, still behind the tree, to the ground. The
operator swinging it around, the flame ascended, of course. I found
the unburned fragment of the tape used last night, a few yards from
here."

I was peering down at Fu-Manchu's servant, the hideous yellow man who
lay dead in a bower of elm leaves.

"He has some kind of leather bag beside him," I began.

"Exactly!" rapped Smith. "In that he carried his dangerous instrument
of death; from that he released it!"

"Released what?"

"What your fascinating friend came to recapture this morning."

"Don't taunt me, Smith!" I said bitterly. "Is it some species of
bird?"

"You saw the marks on Forsyth's body, and I told you of those which I
had traced upon the ground here. They were caused by _claws_, Petrie!"

"Claws! I thought so! But _what_ claws?"

"The claws of a poisonous thing. I recaptured the one used last night,
killed it--against my will--and buried it on the mound. I was afraid
to throw it in the pond, lest some juvenile fisherman should pull it
out and sustain a scratch. I don't know how long the claws would
remain venomous."

"You are treating me like a child, Smith," I said, slowly. "No doubt I
am hopelessly obtuse, but perhaps you will tell me what this Chinaman
carried in a leather bag and released upon Forsyth. It was something
which you recaptured, apparently with the aid of a plate of cold
turbot and a jug of milk. It was something, also, which Karamaneh had
been sent to recapture with the aid--"

I stopped.

"Go on," said Nayland Smith, turning the ray to the left; "what did
she have in the basket?"

"Valerian," I replied mechanically.

The ray rested upon the lithe creature that I had shot down.

It was a black cat!

"A cat will go through fire and water for valerian," said Smith; "but
I got first innings this morning with fish and milk! I had recognized
the imprints under the trees for those of a cat, and I knew that if a
cat had been released here it would still be hiding in the
neighbourhood, probably in the bushes. I finally located a cat, sure
enough, and came for bait! I laid my trap, for the animal was too