An element in the earth's crust, an additive in livestock feed. a medicine in early civilization--and the "toxin of toxins" A pervasive part of our natural environment and everyday lives. arsenic has nonetheless earned a niche in history as a substance of diabolical suppleness. Part II of the first comprehensive and up-to-date two-volume study of arsenic, Arsenic in the Environment is a self-contained work that examines arsenic's complex and potentially deadly chemistry, stressing its effect on human health and the surrounding ecosystem.