“And I know, too,” Hilda answered, in a voice of placid confidence.

“Yet you are not afraid?”

“It is not I who have cause for fear.  The accused may tremble, not the prosecutor.”

“What!  You threaten?”

“No; I do not threaten.  Not in words, I mean.  My presence here is in itself a threat, but I make no other.  You know now, unfortunately, why I have come.  That makes my task harder.  But I will not give it up.  I will wait and conquer.”

Sebastian answered nothing.  He strode into the laboratory alone, tall, grim, unbending, and let himself sink into his easy chair, looking up with a singular and somewhat sinister smile at his bottles of microbes.  After a minute he stirred the fire, and bent his head forward, brooding.  He held it between his hands, with his elbows on his knees, and gazed moodily straight before him into the glowing caves of white-hot coal in the, fireplace.  That sinister smile still played lambent around the corners of his grizzled moustaches.

I moved noiselessly towards the door, trying to pass behind him unnoticed.  But, alert as ever, his quick ears detected me.  With a sudden start, he raised his head and glanced round.  “What! you here?” he cried, taken aback.  For a second he appeared almost to lose his self-possession.

“I came for my clinical,” I answered, with an unconcerned air.  “I have somehow managed to mislay it in the laboratory.”

My carefully casual tone seemed to reassure him.  He peered about him with knit brows.  “Cumberledge,” he asked at last, in a suspicious voice, “did you hear that woman?”

“The woman in 93?  Delirious?”

“No, no.  Nurse Wade?”

“Hear her?” I echoed, I must candidly admit with intent to deceive.  “When she broke the basin?”

His forehead relaxed.  “Oh! it is nothing,” he muttered, hastily.  “A mere point of discipline.  She spoke to me just now, and I thought her tone unbecoming in a subordinate. . . .  Like Korah and his crew, she takes too much upon her. . . .  We must get rid of her, Cumberledge; we must get rid of her.  She is a dangerous woman!”

“She is the most intelligent nurse we have ever had in the place, sir,” I objected, stoutly.

He nodded his head twice.  “Intelligent—­je vous l’accorde; but dangerous—­dangerous!”

Then he turned to his papers, sorting them out one by one with a preoccupied face and twitching fingers.  I recognised that he desired to be left alone, so I quitted the laboratory.

I cannot quite say why, but ever since Hilda Wade first came to Nathaniel’s my enthusiasm for Sebastian had been cooling continuously.  Admiring his greatness still, I had doubts as to his goodness.  That day I felt I positively mistrusted him.  I wondered what his passage of arms with Hilda might mean.  Yet, somehow, I was shy of alluding to it before her.