"The worst of it is," he continued, "that this Amanita somewhat resembles the royal agaric, the Amanita caesarea. It is, as you see, strikingly beautiful, and therefore all the more dangerous."

He ceased a moment, while we looked in a sort of awe at the fatally beautiful thing.

"It is not with the fungus that I am so much interested just now, however," Kennedy began again, "but with the poison. Many years ago scientists a.n.a.lyzed its poisonous alkaloids and found what they called bulbosine. Later it was named muscarin, and now is sometimes known as amanitin, since it is confined to the mushrooms of the Amanita genus.

"Amanitin is a wonderful and dangerous alkaloid, which is absorbed in the intestinal ca.n.a.l. It is extremely violent. Three to five one-thousandths of a gram, or six one-hundredths of a grain, are very dangerous. More than that, the poisoning differs from most poisons in the long time that elapses between the taking of it and the first evidences of its effects.

"Muscarin," Kennedy concluded, "has been chemically investigated more often than any other mushroom poison and a perfect antidote has been discovered. Atropin, or belladonna, is such a drug."

For a moment I looked about at the others in the room. Had it been an accident, after all? Perhaps, if any of the others had been attacked, one might have suspected that it was. But they had not been affected at all, at least apparently. Yet there could be no doubt that it was the poisonous muscarin that had affected Mansfield.

"Did you ever see anything like that?" asked Kennedy, suddenly, holding up the gilt spangle which he had found on the closet floor near the wall safe.

Though no one said a word, it was evident that they all recognized it.

Lewis was watching Madeline closely. But she betrayed nothing except mild surprise at seeing the spangle from her dress. Had it been deliberately placed there, it flashed over me, in order to compromise Madeline Hargrave and divert suspicion from some one else?

I turned to Mina. Behind the defiance of her dark eyes I felt that there was something working. Kennedy must have sensed it even before I did, for he suddenly bent down over the recording needle and the ruled paper on the table.

"This," he shot out, "is a pneumograph which shows the actual intensity of the emotions by recording their effects on the heart and lungs together. The truth can literally be tapped, even where no confession can be extracted. A moment's glance at this line, traced here by each of you, can tell the expert more than words."

"Then it was a mushroom that poisoned Jack!" interrupted Lewis, suddenly. "Some poisonous Amanita got mixed with the edible mushrooms?"

Kennedy answered, quickly, without taking his eyes off the line the needle was tracing:

"No; this was a case of the deliberate use of the active principle itself, muscarin--with the expectation that the death, if the cause was ever discovered, could easily be blamed on such a mushroom.

Somehow--there were many chances--the poison was slipped into the ramekin Francois was carefully preparing for Mansfield. The method does not interest me so much as the fact--"

There was a slight noise from the other room where Mansfield lay.

Instantly we were all on our feet. Before any of us could reach the door Helen Grey had slipped through it.

"Just a second," commanded Kennedy, extending the sequin toward us to emphasize what he was about to say. "The poisoning and the robbery were the work of one hand. That sequin is the key that has unlocked the secret which my pneumograph has recorded. Some one saw that robbery committed--knew nothing of the contemplated poisoning to cover it. To save the reputation of the robber--at any cost--on the spur of the moment the ruse of placing the sequin in the closet occurred."

Madeline Hargrave turned to Mina, while I recalled Lewis's remark about Mina's stepping on the train and tearing it. The defiance in her black eyes flashed from Madeline to Kennedy.

"Yes," she cried; "I did it! I--"

As quickly the defiance had faded. Mina Leitch had fainted.

"Some water--quick!" cried Kennedy.

I sprang through the door into Mansfield's room. As I pa.s.sed I caught sight of Helen Grey supporting the head of Mansfield--both oblivious to actresses, diamonds, everything that had so nearly caused a tragedy.

"No," I heard Kennedy say to Lewis as I returned; "it was not Mina. The person she shielded was wildly in love with her, insanely jealous of Mansfield for even looking at her, and in debt so hopelessly in Mansfield's ventures that only the big diamond could save him--Doctor Murray himself!"

III

THE SOUL-a.n.a.lYSIS

"Here's the most remarkable appeal," observed Kennedy, one morning, as he tossed over to me a letter. "What do you make of that?" It read:

MONTROSE, CONN.

MY DEAR PROFESSOR KENNEDY:

You do not know me, but I have heard a great deal about you. Please, I beg of you, do not disregard this letter. At least try to verify the appeal I am making.

I am here at the Belleclaire Sanatorium, run by Dr. Bolton Burr, in Montrose. But it is not a real sanatorium. It is really a private asylum.

Let me tell my story briefly. After my baby was born I devoted myself to it. But, in spite of everything, it died. Meanwhile my husband neglected me terribly. After the baby's death I was a nervous wreck, and I came up here to rest.

Now I find I am being held here as an insane patient. I cannot get out.

I do not even know whether this letter will reach you. But the chambermaid here has told me she will post it for me.

I am ill and nervous--a wreck, but not insane, although they will tell you that the twilight-sleep treatment affected my mind. But what is happening here will eventually drive me insane if some one does not come to my rescue.

Cannot you get in to see me as a doctor or friend? I will leave all to you after that.

Yours anxiously,

JANET (MRS. ROGER) CRANSTON.

"What do you make of it yourself?" I returned, handing back the letter.

"Are you going to take it up?" He slowly looked over the letter again.

"Judging by the handwriting," he remarked, thoughtfully, "I should say that the writer is laboring under keen excitement--though there is no evidence of insanity on the face of it. Yes; I think I'll take up the case."

"But how are you going to get in?" I asked. "They'll never admit you willingly."

Kennedy pondered a minute. "I'll get in, all right," he said, at length; "come on--I'm going to call on Roger Cranston first."

"Roger Cranston?" I repeated, dumfounded. "Why, he'll never help you!

Ten to one he's in on it."

"We'll have to take a chance," returned Kennedy, hurrying me out of the laboratory.

Roger Cranston was a well-known lawyer and man about town. We found him in his office on lower Broadway. He was young and distinguished-looking, which probably accounted for the fact that his office had become a sort of fashionable court of domestic relations.

"I'm a friend of Dr. Bolton Burr, of Montrose," introduced Kennedy.

Cranston looked at him keenly, but Kennedy was a good actor. "I have been studying some of the patients at the sanatorium, and I have seen Mrs. Cranston there."

"Indeed!" responded Cranston. "I'm all broken up by it myself."

I could not resist thinking that he took it very calmly, however.

"I should like very much to make what we call a psycha.n.a.lysis of Mrs.