"FRANCISCUS ALTRAMARI, "_Cancellarius_." But although the toad under certain conditions was credited with poisonous properties, during the Middle Ages it was esteemed a valuable remedy for the plague, and was employed for that purpose in Austria as late as the year 1712. Cantharides, or Spanish fly, was very commonly used as a poison in mediæval times, the usual method of administering being to chop it up and mix it with pepper. It is said to have been the first poison tried on the unfortunate Sir Thomas Overbury, although his murderers finally finished him off with corrosive sublimate. Poisoned rings are said to have been the invention of the Italians, who fashioned rings in which the poison was inserted in a receptacle where the jewel is usually set. Attached to the inner part of the ring was a sharp point which, when the hand of the wearer was grasped, scratched the flesh and injected the poison. Rings were also used for carrying strong poisons secretly--such as arsenic, or corrosive sublimate--and in this manner many were enabled to commit suicide after being imprisoned. Hyoscyamus, commonly called henbane, is a herb which has been employed from remote times. Benedictus Crispus, Archbishop of Milan, in a work written shortly before A.D. 681, alludes to it under the name of hyoscyamus and symphoniaca, and in the tenth century its virtues are particularly recorded by Macer Floridus. In the early Anglo-Saxon works it is called henbell and sometimes belene. In a French herbal of the fifteenth century it is called hanibane or hanebane. From a very early period it has been employed as a sedative and anodyne, for producing sleep, although simple hallucinations sometimes accompany its use. An old tradition states, that once in the refectory of an ancient monastery the monks were served with henbane, instead of some harmless root, in error by the cook. After partaking of the dish, they were seized with the most extraordinary hallucinations. At midnight one monk sounded the bell for matins, while others walked in the chapel and opened their books, but could not read. Others sang roystering drinking songs and performed mountebank antics, which convulsed the others with uncontrollable laughter, and the pious monastery for the nonce was turned into an asylum. Certain stones which were sold for large sums of money were supposed to change colour when brought near a poisonous substance, and they were consequently much sought after by high personages. The horn of the unicorn was said to become moist when placed near poisoned food. Bickman records his belief that several slow poisons were known to the ancients which cannot now be identified. The Carthaginians also seem to have been acquainted with similar poisons, and, according to tradition, administered some to Regulus, the Roman general. But we cannot endorse Bickman's belief.