That would be all." [Illustration: "'I CALL IT THE SLEEPING DEATH,' ANSWERED THE PROFESSOR"] "I thought," said Corbario, almost carelessly, "that there was no longer any such thing as a poison that left no traces or signs.

Can you not generally detect vegetable poisons by the mode of death ?" "Yes," answered the Professor, returning the glass tube to its case and the latter to his pocket.

"But please to remember that although we can prove to our own satisfaction that some things really exist, we cannot prove that any imaginable thing outside our experience cannot possibly exist.

Imagine the wildest impossibility you can think of; you will not induce a modern man of science to admit the impossibility of it as absolute.

Impossibility is now a merely relative term, my dear Corbario, and only means great improbability.