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?"
"Yes!" answered the specialist frankly. "There are. But—I should not expect to hear of their use in London."
"Is there any European expert who might throw some light on this case?" asked the Coroner.
"Yes," said Dr. Sperling-Lawson. "One man—Professor Gagnard, of Paris. As a matter of fact, I have already sent certain portions of certain organs to him—by a special messenger. If he cannot trace this poison,
