"Please explain what the symptoms of morphine poisoning are?"
"Cold sweat, slow pulse, stertorous breathing, a gradually deepening coma, contracted pupils, which, however, slowly dilate at the approach of death, which is caused by a paralysis of the respiratory centres."
"Did you observe any of these symptoms in Miss Sloane?"
"Yes. Practically all of them."
"And would these same symptoms occur in any other form of death, except from morphine poisoning?"
"They would not. Of course they do not apply to morphine only. They are generally diagnostic of opium poisoning."
"But morphine is a form of opium, is it not?"
"Yes. It is one of the alkaloids."
"Now, Doctor, one more question. You have testified that you attended this girl in her last illness; as a physician you are familiar with death from diphtheria; you have stated what are the symptoms of morphine, or opium poisoning, and that you observed them in this case; further, that an identical set of symptoms would not occur in any other disease known to you; now, from these facts, what would you say caused the death of Miss Mabel Sloane?"
"I should say that she died of a poisonous dose of some form of opium, probably morphine."