A shiny gray element with atomic symbol As, atomic number 33, and atomic weight 75. It occurs throughout the universe, mostly in the form of metallic arsenides. Most forms are toxic. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), arsenic and certain arsenic compounds have been listed as known carcinogens. (From Merck Index, 11th ed)
    

concept

A horse-drawn hearse pulls away from a doctor's; representing the dire state of the medical establishment according to James Morison, pill-vendor and self-styled 'Hygeian'. Lithograph, c. 1848.

A patient suffering adverse effects of arsenic treatment. Coloured lithograph, ca. 1850.

An unscrupulous chemist selling a child arsenic and laudanum. Wood engraving after J. Leech.

Furnace used in processing arsenic. Etching.

Separation of arsenic : From the Transactions of the Society of Arts. Vol. LI. The large gold medal was presented to Mr. James Marsh, of the Royal Arsenal, Woolwich, for his method of separating small quantities of arsenic from substances with which it may have been mixed. / [By James Marsh].

Minutes of evidence and appendices. Vol. 2, Evidence received in 1902-3, together with appendices 16 to 32, and index (Being part 2 of the Final report of the Commission) / Royal Commission on Arsenical Poisoning arising from the consumption of beer and other articles of food or drink.

Studies in the treatment of malaria. XIX, Intravenous injections of disodoluargol in simple tertian malaria / by J.W.W. Stephens [and others].

Arsenic as a larvicide for anopheline larvæ / by M.A. Barber and T.B. Hayne.

King of poisons : a history of arsenic / John Parascandola.

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Separation of arsenic : From the Transactions of the Society of Arts. Vol. LI. The large gold medal was presented to Mr. James Marsh, of the Royal Arsenal, Woolwich, for his method of separating small quantities of arsenic from substances with which it may have been mixed. / [By James Marsh].

Minutes of evidence and appendices. Vol. 2, Evidence received in 1902-3, together with appendices 16 to 32, and index (Being part 2 of the Final report of the Commission) / Royal Commission on Arsenical Poisoning arising from the consumption of beer and other articles of food or drink.

Studies in the treatment of malaria. XIX, Intravenous injections of disodoluargol in simple tertian malaria / by J.W.W. Stephens [and others].

Arsenic as a larvicide for anopheline larvæ / by M.A. Barber and T.B. Hayne.

King of poisons : a history of arsenic / John Parascandola.