According to Chapuis (“Traité de Toxicologie”), Simon at first dropped a little of the liquor in the phials on oil of tartar and sea water, but nothing was precipitated. Then he digested some of it in a mattrass on a sand-bath, but on distilling it no substance of acid or acrid taste was yielded, and no fixed salts were left. Having poisoned a pigeon, a dog, and a fowl with the liquid, he could only discover on opening the dead bodies a little clotted blood in the ventricule of the heart. Some of the powder deposited by the liquid was given to a cat which vomited for half an hour and then died. Simon explains that poisons generally sink to the bottom of water, and when tested by fire the innocent part is dissipated and only the acrid and piquant principle remains. But this poison of Ste. Croix’s, floated on water, and tried by fire, left only something sweet and innocent. It in fact ruled the elements, and killed animals without leaving any trace. Utterly baffled, the expert concludes: “It is a terrible, diabolic, intangible (_insaissable_) poison.” TOFANA. About the same time the woman Tofana was selling her Aquetta di Napoli in Italy, but she was not brought to justice until 1709, when she confessed to the Pope and the Emperor Charles VI that her drops contained arsenic, and that by them she had caused the deaths of more than six hundred persons. The Emperor repeated her story to his physician, Garelli, by whom it was communicated to Hoffmann, who published it in his “Rational Medicine.” She preferred to prepare her drops by rubbing arsenic into the broken joints of a hog just killed and then collecting the juice. Tofana took refuge in a convent and lived for some twenty years after her condemnation. A letter from the English Secretary of State to the Commissioners of Customs, dated July 29, 1717, is on record, cautioning them against admitting a liqueur called Aqua Tufania from Italy, as accounts of its dangerous character had been received from the British envoys at Naples and Genoa. THE CHAMBRE ARDENTE.