It was discovered in 1886 by C. Winkler in argyrodite, a mineral found at Freiberg in Saxony.
When passed with carbon dioxide through a red-hot tube it yields carbon oxysulphide, COS (C. Winkler), and when passed over sodamide it yields ammonium thiocyanate.
Other elements predicted and characterized by Mendeleeff which have been since realized are gallium, discovered in 1875, and germanium, discovered in 1885 by Clemens Winkler.
C. Winkler decided the atomic weight of germanium by similar reasoning.
Tupaya, a Tahitian, who accompanied Captain Cook in the " Endeavour " to Europe, supplied his patron with maps; Raraka drew a map in chalk of the Paumotu archipelago on the deck of Captain Wilkes's vessel; the Marshall islanders, according to Captain Winkler (Marine Rundschau, Oct.