Purdie did remember, and he looked at the famous expert with great interest. There was, however, nothing at all remarkable about Dr. Sperling-Lawson's appearance—he was a quiet, self-possessed, plain-faced gentleman who might have been a barrister or a banker for all that any one could tell to the contrary. He gave his evidence in a matter-of-fact tone—strongly in contrast to Dr. Mirandolet's somewhat excited answers—but Purdie noticed that the people in court listened eagerly for every word.
He happened to be at the hospital, said Dr. Sperling-Lawson, when the man Parslett was brought in, and he saw him die. He fully agreed with Dr. Mirandolet that it was impossible to do anything to save the man's life when he was brought to the hospital, and he was quite prepared to say that the impossibility had existed from the moment in which Gardiner had seen Parslett collapse. In other words, when Parslett did collapse, death was on him.
"And—the cause of death?" asked the Coroner.
"Heart failure," replied the witness.
"Resulting from—what?" continued the Coroner.
Dr. Sperling-Lawson hesitated a moment—amidst a deep silence.
"I cannot answer that question," he said at last. "I can only offer an opinion. I believe—in fact, I am sure!—the man was poisoned. I am convinced he was poisoned. But I am forced to admit that I do not know what poison was used, and that after a most careful search I have not yet been able to come across any trace or sign of any poison known to me. All the same, I am sure he died from the effects of poison, but what it was, or how administered, frankly, I do not know!"
"You made a post-mortem examination?" asked the Coroner.
"Yes," replied the specialist, "in company with Dr. Seracold. The deceased was a thoroughly healthy, well-nourished man. There was not a trace of disease in any of the organs—he was evidently a temperate man, and likely to live to over the seventy years' period. And, as I have said, there was not a trace of poison. That is, not a trace of any poison known to me."
"I want to ask you a particularly important question," said the Coroner. "Are there poisons, the nature of which you are unacquainted with?"