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 membrane or membrane of the air passages is a comparatively rare accident, which can take place only in consequence of arsenical gases or vapours being incautiously breathed. The effects of oxide of arsenic when introduced in this way are described from personal experience by Otto Tachenius, a chemist of the sixteenth century.

"Once," said he, "when I happened to breathe incautiously the fumes of arsenic, I was surprised to find my palate impressed with a sweet, mild, grateful taste, such as I never experienced before. But in half an hour I was attacked with pain and tightness in the stomach, then with general convulsions, difficult breathing, an unspeakable sense of heat, bloody and painful micturition, and finally with such an acute colic as contracted my whole body for half an hour." By the use of oleaginous drinks he recovered from these alarming symptoms; but during all the succeeding winter he had a low hectic fever.

Balthazar Timæus relates a similar case which came under his notice. An apothecary of Colberg, while subliming arsenic, had not been careful enough to avoid the fumes; and was soon after seized with frequent fainting, tightness in the præcordia, difficult breathing, inextinguishable thirst, parched throat, great restlessness, watching, and pains in the feet. He had afterwards profuse daily perspiration and palsy of the legs; and several months elapsed before he got entirely well. The same author says that the famous Paracelsus, being one day put out of temper by an acquaintance, made him hold his nose over an alembic in which arsenic was subliming; and that the object of this severe joke nearly lost his life in consequence. Wibmer quotes the heads of several cases where swelling of the tongue, headache and giddiness, nausea, and an oppressive sense of constriction in the throat, were occasioned by the incautious inhalation of arsenical fumes. The following extraordinary case, closely allied to malignant cholera in its early stage, has been ascribed by the reporter Dr. Welper of Berlin to the inspiration of arsenical fumes,—with what probability I am not prepared to say. A stout healthy man, who in the forenoon had freely and for some time exposed himself to the steam from a vessel where he was boiling several ounces of orpiment in water, was attacked at night with sickness, and next morning with extreme weakness and some difficulty of breathing. These symptoms were greatly relieved by an emetic. But towards evening the extremities became ice-cold and very stiff, the breathing much oppressed, the pulse very hurried, and imperceptible except in the neck, the mouth and throat dry, and the tongue rigid; but the mind remained clear, though anxious and afraid of impending dissolution. His state of collapse was removed in twelve hours by fomentations, and in no long time he recovered entirely except from the dyspnœa, which continued more or less till a few years afterwards, when he died of hydrothorax.