The history of the Left Bank is examined from various points of view by the Comité d’Etudes, i: _L’Alsace-Lorraine et la frontière du Nord-est_ (1918). E. Babelon, _Le Rhin dans l’histoire_ (Paris, 1916-17), is the fullest account from the point of view of the Rhine as the historical frontier of France. See also L. Madelin, in the _Revue des deux Mondes_, December 1, 1918; the pamphlets of Babelon, Driault, de Grailly, Milhaud, Stiénon, etc., issued in the same years; and the _enquête_ published by the _Libre Parole_ in February 1919. For a sane French criticism see Pfister, in _Revue historique_, cxxvi, pp. 334-338. A. Schulte, _Frankreich und das linke Rheinufer_ (Stuttgart, 1918), is largely a critique of French writers. For the important period 1794-1814 the best German accounts are C. T. Perthes, _Politische Zustände und Personen in Deutschland zur Zeit der französichen Herrschaft_ (Bonn, 1862); and J. Hashagen, _Das Rheinland und die französische Herrschaft_ (Bonn, 1908). An excellent French monograph is Ph. Sagnac, _Le Rhin français pendant la Révolution et l’Empire_ (Paris, 1917). On Landau and Saarlouis, see Aulard, in _Revue de Paris_, March 15, 1919. J. Hansen (ed.), _Die Rheinprovinz 1815-1915_ (Bonn, 1917), is a comprehensive treatment of the Prussian period, with brief bibliographies. For a sketch of economic conditions, see Yves Guyot, _La province rhénane et la Westphalie_ (Paris, 1915). On the Palatinate, see H. Schreibmüller, _Bayern und die Pfalz, 1816-1916_ (Kaiserslautern, 1916). The French side of the negotiations respecting the ‘guarantees’ on the Left Bank is given by A. Tardieu, in _L’Illustration_, February 14, 1920. Nothing has as yet been published by the British or American negotiators. The commerce of the Rhine is well studied by E. J. Clapp, _The Navigable Rhine_ (Boston, 1911). Cf. P. Vidal de la Blache, _La France de l’Est_ (Paris, 1917); and the studies of de Martonne and Gallois in the volume of the _Comité d’Etudes_. For a Swiss view of the problem, see V. S. Rualens-Marlier, _Le Rhin libre_ (Paris and Neuchâtel, 1916). * * * * * In the Saar valley the events of 1814-15 are narrated by A. Ruppersberg, _Geschichte der Stadt Saarbrücken_ (Saarbrücken, 1913). Böcking’s correspondence will be found, with other important material, in A. Krohn, _Beiträge zur Geschichte der Saargegend_, in _Mitteilungen des historischen Vereins für die Saargegend_, viii (1901). Cf. F. Engerand, _L’Allemagne et le fer_ (Paris, 1916), ch. 2. For a general sketch, see E. Babelon, _Sarrelouis et Sarrebruck_ (Paris, 1918). Of the German literature touching this part of the treaty examples are F. Meinecke, _Geschichte der linksrheinischen Gebietsfragen_, with maps; and the articles in _Die Woche_, March 8, 1919.