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.