d, as I entered the
laboratory, I saw him engaged in checking up two series of tests which
he had been making.

"Have you found anything yet?" I asked.

He pointed to a corner where he kept a couple of guinea-pigs. They were
sound asleep, rolled up in little fluffy balls of down. Ordinarily, in
the morning, I found the little fellows very frisky.

"Yes," he said; "I think I have found something. I have injected just a
drop of blood from Lady Lee into one of them, and I think he's good for
a long sleep."

"But how about the other one?" I asked.

"That's what puzzles me," ruminated Kennedy. "Do you remember that
bottle I picked up last night? I haven't finished the analysis of the
blood or of the contents of the bottle, but they seem to contain at
least some of the same substances. Among the things I find are
monopotassium phosphate and sarcolactic acid, with just a trace of
carbon dioxide. I injected some of the liquid from the bottle into the
other fellow, and you see what the effect is--the same in both cases."

The telephone bell rang excitedly.

"Is there a Mr. Kennedy there?" asked Long Distance, adding, without
waiting for an answer, "Hold the wire, please."

I handed the receiver to Kennedy. The conversation was short, and as he
hung up the receiver, Craig turned to me.

"It was Broadhurst at the Idlewild Hotel," he said quickly. "Today is
the day of the great Interurban Handicap at Belmore Park with stakes of
twenty-five thousand dollars. Usually they take the horse over to the
track at least a week or two before the race, but as Broadhurst's stable
is so near, he didn't do it--hoping he might keep a better watch over
Lady Lee. But she's no better. If the horse is being tampered with, he
wants to know who is doing it and how."

Kennedy paused a moment, then went over to a cabinet and took from it a
bottle and a very large-sized hypodermic.

We must have been among the first on the field at Belmore Park that day.
Lady Lee had been sent over there after we left Northbury the day
before, under the care of Murchie and McGee, and had been stabled in the
quarters on the track which had been assigned to Broadhurst.

With Broadhurst, who was waiting for us, we lounged across the field in
the direction of the stables. There was no doubt about it, Lady Lee was
not in prime condition. It was not that there was anything markedly
wrong, but to the trained observer the famous race-horse seemed to lack
just a tri