"You don't need to talk about me as if I were a baby," I interjected, my eyes burning with a strange anger.

"Hush, dear--you trust me, don't you?" I heard Helen say.

"Of course," I said, baffled and abandoning the struggle. It was all right to leave it in her hands.

"That's one of the symptoms," Dr. Sinclair coughed into the palm of his hand. I could hear every syllable. "Extreme excitability and irritation; the least little thing will arouse it. Hence caution, my dear young lady, caution. Keep on with the jellied boullion--not too much--just a few, spoonfuls--"

"d.a.m.n it, I'm not an invalid!" I tried to shout, but my voice broke, and only husky, throaty sounds came forth. "I beg your pardon, Mr.

Claybourne--I didn't mean to swear before Helen--but I don't like that smug, oily, self-satisfied man--" and I pointed my finger at Dr.

Sinclair. The latter took a step or two backward, like a person retreating from an unpleasant footing.

"Ahem!" coughed Dr. Sinclair. "I think, Miss Helen, it will be wiser to tell him--you can do it best, without exciting him. Er--I'll look in again this evening." Mr. Claybourne accompanied him downstairs.

"What are they planning to do with me now?" and I tried to rise up on one elbow, but found it unaccountably beyond my strength. Helen put one arm around me.

"You believe in me, don't you, Ted?"

"Yes," and I clutched her hand. "Please keep the others away from me. I must tell you something--it's important--"

Knowlton arose. "Don't bother about that now, Ted," he said. "I know all about the Texas formula--it's all right--do you get me?"

"I think I'd go, Mr. Knowlton," Helen said. "Let me tell him all by myself."

Knowlton bowed and shook her hand. Then he came over to me and offered his hand to me.

"Ted, I'm not much of a talker; this is just to tell you I'm glad."

I took his hand, since he seemed to wish it, and he left the room. I looked around at Helen: "Why did you come to me at the laboratory last night in mediaeval dress when Prospero was trying an incantation?"

Her face clouded, and she hastened to me, laying her cool hand on my forehead.

"Hush, Teddy, sweetheart," she put her face close to mine. I could feel that her eyelashes were wet.

"It was the formula--not an incantation," I went on--"it must have been the signs of the Zodiac that confused me."

"Teddy, do you know me?--it's Helen," she kissed into my ear.

"I know, dear, I know," I said. "I love you, Lady Grey Eyes."

She kissed me on the mouth. "Then listen, Ted, and try not to interrupt.

Just lie quietly here and hold my hand."

"Of course," I promised.

"Prospero was a very wicked man, Ted--"

"He drank and was a drug fiend, but he does know the formula--"

"You promised not to interrupt." Every word of her gentle voice was soothing; I could feel it steal over me, driving away a great fatigue.

"Quite quiet, Ted?"

"Yes."

"That night at the laboratory he tried to poison you, Ted, with fumes from a mixture in a dish. You were unconscious when they found you."

I laughed weakly, it all sounded so preposterous.

"You don't know chemistry, dear," I said, feeling quite superior. "He couldn't poison me that way without poisoning himself."

"He did," Helen said very slowly. "When they found you, Prospero was dead."

It took a long time for this to get into my brain in plausible shape.

"Prospero--dead?" I puzzled.

"Yes, dear."

"But there was nothing poisonous in the fumes of the Texas formula--only an aromatic oil to deceive meddlers."

"Prospero used that oil as a solvent for the poison--you see, Ted, I've been studying chemistry too--I shall read you the a.n.a.lysis we had made, tomorrow."

"a.n.a.lysis--then you've found out the Texas formula?"

"Yes, Ted. It's all right--the factory is making it now."

"Did you work it out?" I asked--the puzzle was only slowly unravelling.

"No, dear--my chemistry hasn't gone that far! The young a.s.sistant Knowlton got from the Owens' Company did it."

"And the poison?"

"That was the difficulty. When we first got to you, Ted, we didn't know what it was, or what antidote to use. Your heart had slowed down to almost nothing--"

"There is a poison chart with a list of the symptoms and antidotes in my desk."

"Yes, Ted. I found that, and we got Dr. Sinclair quickly."

"You found it?"

"It was about five in the morning when one of the foremen happened to go into your laboratory. It made him ill, for the place was reeking--you and Prospero were lying on the floor. He threw open the windows and telephoned Mr. Knowlton. He dressed and called up father, and I went too, in spite of my knee."

"But why did Knowlton call up your father?"

"To let me know, Ted. Wasn't that dear of him? And I was really able to help. They wanted to take you to a hospital, but dad wouldn't listen to that--and so here you are."

I kissed her hand and tried to put in order the story as she had told it.

"I wonder why it didn't kill me, if it killed Prospero?"