Carboneum hydrogenisatum. Carburetted hydrogen, Ethene, Olefiant gas, C 2 H 4 . This gas is sparingly soluble in water, but considerably soluble in alcohol. Authorities. [To the proving of Sir Humphrey Davy are added some selected cases of poisoning by illuminating gas ; this latter gas is of complex and somewhat variable composition, containing marsh gas, olefiant gas, hydrogen, carbonous oxide, nitrogen, vapors of volatile hydrocarbons, and vapor of carbonic sulphide; it thus occupies a position between carbonous oxide and carbonic sulphide; the cases here collected possess sufficient interest to justify their insertion, though obtained from such a variable source.] 1 , Sir H. Davy, from Paris's Life of Davy (Lond. Med. Gaz., 7, 563), inhaled the pure gas from a bag; 2 , Sedillot, Gaz. de Strast., 1845 (S. J. Suppl., vol. 4), poisoning by illuminating gas ; 3 , Seitz, Deutsch. Kl., 1852 (S. J., 76, p. 187), ibid.; 4 , Gaertner, Wurt. Corr. Bl., 1853 (S. J., 79, p. 288), ibid.; 5 , Cless, Wurt. Corr. Bl., 1854 (S. J., 86, p. 34), ibid.; 6 , Jaushet, L'Union, 1857 (S. J., 95, p. 76), suffocated by coal damp ; 7 , Otho, Gaz. Sarda., 1858 (S. J., 98, 171), poisoning by illuminating gas ; 8 , Leopold, V. f. Ger. Med., 1858 (S. J., 100, 293), ibid.; 9 , Mayer, Om. Schr. f. Geburt, 1858 (S. J., 104, 189), poisoning of two pregnant women by illuminating gas; 10 , Schumacher, Henke Zeit., 1862 (S. J., 113, p. 292), poisoning by il luminating gas; 11 , Sieveking, Lancet, 1869, ibid.; 12 , Wallichs, Deutsche Klin., 1869 (S. J., 151, 273), ibid.; 13 , De Chaumont, Lancet, 1873, poisoning by coal gas; 14 , William Taylor, M.D., Monograph on poisoning by coal gas, Edinb., 1874; 15 , Tourdes (six cases, five fatal) from Taylor's work; 16 , Maclagan, cases from Taylor's work.