Sidonia took it up and immediately the liquid was filled with a million sparks of fire. It was the Aqua Tofana, undiluted, instantaneous in its effect, and not medicable by antidotes. Once administered there was no more hope for its victim than for the souls of the damned who have received the final judgment. One drop of the sparkling water upon the tongue of a Titan would blast him like Jove's thunderbolt, shrivel him up to a black, unsightly cinder. This terrible water was rarely used alone by the poisoners, but it formed the basis of a hundred slower potions which ambition, fear or hypocrisy, mingled with the element of time, and colored with the various hues and aspects of natural disease. Theodora had again taken her seat and leaned towards Sidonia, supporting her chin in the palm of her hands, as she bent eagerly over the table, drinking in every word as the hot sand of the desert drinks in the water that falls upon it. "What is that?" she pointed to a phial, white as milk and seemingly harmless, and while she questioned, her busy brain worked with feverish activity. The Aqua Tofana she had used when she struck down Roxana and her too talkative lover on the night of the feast in her garden. But now she required a different concoction to complete the vengeance on her rival. "This is called Lac Misericordiae," replied Sidonia. "It brings on painless consumption and decay! It eats the life out of man or woman, while the moon empties and fills. The strong man becomes a skeleton. Blooming maidens sink to their graves blighted and bloodless. Neither saint or sacrament can arrest its doom. This phial"--and she took another from the cabinet, replacing the first--"contains innumerable griefs that wait upon the pillows of rejected and heartbroken lovers, and the wisest mediciner is mocked by the lying appearances of disease that defy his skill and make a mock of his wisdom." There was a moment's silence. At last Theodora spoke. "Have you nothing that will cause fear--dread--madness--ere it strikes the victim dumb forever more? Something that produces in the brain those dreadful visions--horrid shapes--peopling its chambers where reason once held sway?" For a moment Sidonia and Theodora held each other's gaze, as if each were wondering at the wickedness of the other. "This," Sidonia said at last, taking out a curiously twisted bottle, containing a clear crimson liquid and sealed with the mystic Pentagon, "contains the quintessence of mandrakes, distilled in the alembic, when Scorpio rules the hour. It will produce what you desire." "How much of it is required to do this thing?" "Three drops. Within six hours the unfailing result will appear." "Give it to me!" "You possess rare ingenuity, Lady Theodora," said Sidonia, placing her hand in that of her caller. "If Satan prompts you not, it is because he can teach you nothing, either in love or stratagem."