We are indebted to Mr. E. A. S. Clarke, Secretary of the American Iron and Steel Institute, for calling our attention to an article in the 1901 Transactions of the British Institute which places the oldest joint-stock enterprise in the world at Domnarfvet, Sweden. It is the Stora Kopparbergs (Great Copper Mountain) Mining Company, deriving its name from the celebrated copper mine at Falun, where one of its plants is located.