I am assured that there are many poisons known only to a few chemists in the world, a single grain of which is sufficient to destroy the strongest man and leave not the slightest trace behind.

If the poisoner be sufficiently accomplished he can pursue his--calling without the faintest risk of detection." Mr.Sabin sipped his wine thoughtfully.
"The Prince is, I believe, right," he remarked.

"It is for that reason, doubtless, that I have heard of men whose lives have been threatened, who have deposited in safe places a sealed statement of the danger in which they find themselves, with an account of its source, so that if they should come to an end in any way mysterious there may be evidence against their murderers." "A very reasonable and judicious precaution," the Prince remarked with glittering eyes.

"Only if the poison was indeed of such a nature that it was not possible to trace it nothing worse than suspicion could ever be the lot of any one." Mr.Sabin helped himself carefully to salad, and resumed the discussion with his next course.
"Perhaps not," he admitted.

"But you must remember that suspicion is of itself a grievous embarrassment.