eral disorganisation of the blood-corpuscles, a most peculiar thing, but one the significance of which none of us here can fathom. If it was poison that he took or that had been given to him, it was the most subtle, intangible, elusive, that ever came to my knowledge. Why, there is absolutely no trace or clue—"
"Nor any use in looking for one in that way," broke in Kennedy decisively. "If we are to make any progress in this case, we must look elsewhere than to an autopsy. There is no clue beyond what you have found, if I am right. And I think I am right. It was the venom of the cobra."
"Cobra venom?" repeated the coroner, glancing up at a row of technical works.
"Yes. No, it's no use trying to look it up. There is no way of verifying a case of cobra poisoning except by the symptoms. It is not like any other poisoning in the world."
Dr. Leslie and I looked at each other, aghast at the thought of a poison so subtle that it defied detection.
"You think he was bitten by a snake?" I blurted out, half incredulous.
"Oh, Walter, on Broadway? No, of course not. But cobra venom has a medicinal value. It is sent here in small quantities for various medicinal purposes. Then, too, it would be easy to use it. A scratch on the hand in the passing crowd, a quick shoving of the letter into the pocket of the victim—and the murderer would probably think to go undetected."
We stood dismayed at the horror of such a scien-
