The Passing of the Frontier: a Chronicle of the Old West. By Emerson Hough. [Chronicles of America series, vol. XXVI.] (New Haven: Yale University Press. 1918. Pp. x, 181), The Forty-Niners: a Chronicle of the California Trail and El Dorado. By Stewart Edward White. [Id., vol. XXV.] (Ibid. 1918. Pp. ix, 273.), The Day of the Confederacy: a Chronicle of the Embattled South. By Nathaniel W. Stephenson. [Id., vol. XXX.] (Ibid. 1919. Pp. xi, 214.), Abraham Lincoln and the Union: a Chronicle of the Embattled North. By Nathaniel W. Stephenson. [Id., vol. XXIX.] (Ibid. 1918. Pp. xiv, 272.), The Anti-Slavery Crusade: a Chronicle of the Gathering Storm. By Jesse Macy. [Id., vol. XXVIII.] (Ibid. 1919. Pp. ix, 245.) and The Cotton Kingdom: a Chronicle of the Old South. By William E. Dodd. [Id., vol. XXVII.] (Ibid. 1918. Pp. x, 161.)