The labor problem of to-day, by F. A. Walker.--The source of business profits, by F. A. Walker.--The economic and social importance of the eight-hour movement, by G. Gunton.--The condition of labor: an open letter to Pope Leo XIII, by H. George.--What means this strike? By D. DeLeon.--The evolution of wage statistics, by C. D. Wright.--The American Federation of Labor, by M. A. Aldrich.--The I.W.W., by V. St. John.--Organized labor, by James Cardinal Gibbons.--The open shop, by C. S. Darrow.--The trade union movement, by J. Mitchell.--Shall trade unions be regulated by law? By S. Untermyer and M. Hillquit.--The American labor movement, by L. Wolman.--The American labor movement, by F. J. Haas.