Dr. Jarvis tried to speak, but the words would not come. He staggered and fell half-fainting into a chair.
"I cannot tell it," he said, when he had somewhat revived. "Wait till I am stronger."
"Perhaps that will not be necessary," said Nick.
"No, no; why should it?" said the prisoner, in a faint voice. "I confess, and that is the end of it."
"However, we would like to know more fully about this affair," said Byrnes, and he looked inquiringly at Nick.
"Let me tell the story," said Nick to Jarvis. "If I am right, you have only to nod. That will do for the present occasion. We are not taking testimony."
"But how do you know--" Deever began.
The superintendent cut him short.
"Proceed, if you please," said he to Nick, and then he fixed his eyes upon Dr. Jarvis.
"In the garden of the hospital," Nick began, "about half-past six o'clock on the evening of Monday last, you had high words with Patrick Deever, who was working under your direction."
Dr. Jarvis nodded, as Nick paused.
"He was somewhat intoxicated, and his language was very abusive. You replied in violent reproval, and he started forward, as if about to attack you."
Again the doctor made a sign of assent.
"You seized a spade--"
"It was in my hand," the doctor interrupted, feebly.
"That is right; correct me whenever I am in error. You raised the spade and struck Deever upon the head.
"He fell to the ground, and you, bending over him, were horrified to find that he was dead; or, rather, that he seemed to be.
"Exactly how he came to life I do not know, but it must have been while you were in the midst of your terror, and beginning to wonder what you would do with the body."
"How do you know all this?" asked the doctor, faintly.
"It is simply the only explanation of all the facts. The witness Klein heard the quarrel and the blow. That blow did not fall upon you, and there was nobody else present but Patrick Deever.
"Now, then, he suddenly came to himself. He sprang up. You were amazed.
You advanced toward him.
"Believing that you intended to renew the attack, he ran away. He scaled the garden wall, and fled through the little grove toward the river."
"You are reading my mind," exclaimed the doctor, whose amazement acted as a restorative.
"No, I am not. How else could he have got out? On one side was Klein, on the other St. Nicholas avenue, with many people who would have seen him.
He escaped toward the river."
"Then you didn't kill him, after all?" asked the superintendent.
"Of the remainder of that fatal affair," said Dr. Jarvis, "I have only one explanation to give, and that will seem miraculous.
"His body was found buried in the garden. I was seen to bury it. I was seen carrying it there by night.
"But upon my soul, I did not know that I did it. The evidence has convinced me, that is all.
"And this is the explanation: Patrick Deever, after escaping from the grove, must have fallen and died. I must have gone there in my sleep, have found the body, and brought it back to the garden.
"My habit of sleep-walking is well known. I have done things which, from a scientific point of view, were far more marvelous than this."
"Nonsense!" cried Deever; "you were wide enough awake. Superintendent Byrnes will not swallow that story."
"Is it any more wonderful," said Nick, "than what I saw the doctor do in his laboratory?"
The story of that night he had already told to Deever and the superintendent.
"Very little, if any," said Byrnes.
"I passed that night, or supposed that I passed it, at my home," said the doctor. "I took an opiate, and seemed to sleep. But I had dreams of murder and the hiding of dead bodies. I must have walked. It was fate."
"But the wounds upon the body? How about them?" asked Byrnes.
"They must have been made while he was pounding the body down into the earth," said Deever, quickly.
Then he turned to Nick.
"You promised me an arrest within the hour," he said; "now let me have the satisfaction of seeing it formally made."
"Wait," said Nick. "I have yet several minutes; and here is the witness, John Flint."
The man was brought in as Nick spoke. He seemed to be somewhat alarmed.
"What's wanted?" he said.
"Only a little formality," said Nick. "As you do not wish to appear in court, we desire to take your sworn testimony at this time."
The sweat stood out on Flint's forehead, but when the proper arrangements had been made, he took the oath and told his story.
"And now, Dr. Jarvis," said Nick, "it is my very agreeable duty to recommend that you be discharged from custody."
"What!" cried Jarvis and Deever in the same breath.
"Superintendent Byrnes, I appeal to you," Deever exclaimed.
The face of the superintendent was perfectly calm.
"The case is in Mr. Colton's hands," he said, simply.