(1) Bagehot, Walter. _Physics and Politics._ Or thoughts on the application of the principles of "Natural Selection" and "Inheritance"

to political society. Chap. v, "The Age of Discussion," pp. 156-204. New York, 1875.

(2) Robertson, John M. _A Short History of Free Thought, Ancient and Modern._ 2 vols. New York, 1906.

(3) Windelband, Wilhelm. _Geschichte der alten Philosophie._ "Die Sophistik und Sokrates," pp. 63-92. Munchen, 1894.

(4) Mackay, R. W. _The Progress of the Intellect as Exemplified in the Religious Development of the Greeks and Hebrews._ 2 vols. London, 1850.

(5) Stephen, Sir Leslie. _History of English Thought in the Eighteenth Century._ 2d ed., 2 vols. London, 1881.

(6) Damiron, J. Ph. _Memoires pour servir a l'histoire de la philosophie au 18ieme siecle._ 3 vols. Paris, 1858-64.

(7) Draper, J. W. _History of the Intellectual Development of Europe._ Rev. ed., 2 vols. New York, 1904.

(8) ----. _History of the Conflict between Religion and Science._ New York, 1873.

(9) Lecky, W. E. H. _History of the Rise and Influence of the Spirit of Rationalism in Europe._ Rev. ed., 2 vols. New York, 1903.

(10) White, Andrew D. _History of the Warfare of Science with Theology._ An expansion of an earlier essay, "The Warfare of Science," 2d. ed., 1877. 2 vols. New York, 1896.

(11) Haynes, E. S. P. _Religious Persecution._ A study in political psychology. London, 1904.

II. TYPES OF CONFLICT

A. _War_

1. Psychology and Sociology of War:

(1) Darwin, Charles. _The Descent of Man._ Chaps. xvii and xviii.

"Secondary s.e.xual Characters of Mammals," pp. 511-67. (Gives account of the fighting instinct in males and the methods of fighting of animals.) 2d rev. ed. New York, 1907.

(2) Johnson, George E. "The Fighting Instinct: Its Place in Life,"

_Survey_, x.x.xV (1915-16), 243-48.

(3) Thorndike, Edward L. _The Original Nature of Man._ "Fighting," pp.

68-75. New York, 1913.

(4) Hall, G. Stanley. "A Study of Anger," _American Journal of Psychology_, X (1898-99), 516-91.

(5) Patrick, G. T. W. _The Psychology of Social Reconstruction._ Boston, 1920.

(6) ----. _The Psychology of Relaxation._ Chap. vi, "The Psychology of War," pp. 219-52. Boston, 1916.

(7) Pillsbury, W. B. _The Psychology of Nationalism and Internationalism._ New York, 1919.

(8) Trotter, W. _Instincts of the Herd in Peace and War._ London, 1916.

(9) La Gra.s.serie, R. de. "De l'intolerance comme phenomene social,"

_Revue International de Sociologie_, XVIII (1910), 76-113.

(10) Percin, Alexandra. _Le Combat._ Paris, 1914.

(11) Huot, Louis, and Voivenel, Paul. _Le Courage._ Paris, 1917.

(12) Porter, W. T. _Shock at the Front._ Boston, 1918.

(13) Lord, Herbert Gardiner. _The Psychology of Courage._ Boston, 1918.

(14) Hall, G. Stanley. _Morale, the Supreme Standard of Life and Conduct._ New York, 1920.

(15) Roussy, G., and Lhermitte, J. _The Psychoneuroses of War._ Translated by W. B. Christopherson. London, 1918.

(16) Babinski, J. F., and Froment, J. _Hysteria or Pithiatism, and Reflex Nervous Disorders in the Neurology of the War._ Translated by J.

D. Rolleston, with a preface by E. Farquhar Buzzard. London, 1918.

2. The Natural History of War:

(1) Sumner, William G. _War and Other Essays._ Edited with an introduction by Albert Galloway Keller. New Haven, 1911.

(2) Letourneau, Ch. _La Guerre dans les diverses races humaines._ Paris, 1895.

(3) Frobenius, Leo. _Weltgeschichte des Krieges._ Unter Mitwirkung von Oberstleutnant a. D. H. Frobenius u. Korvetten-Kapitan a. D. E.

Kohlhauer. Hannover, 1903.

(4) Bakeless, John. _The Economic Causes of Modern Wars._ A study of the period 1878-1918. New York, 1921.

(5) Crosby, Oscar T. _International War, Its Causes and Its Cure._ London, 1919.

(6) Sombart, Werner. _Krieg und Kapitalismus._ Studien zur Entwicklungsgeschichte des modernen Kapitalismus. Vol. II, Munchen, 1913.

(7) Lagorgette, Jean. _Le Role de la guerre._ etude de sociologie generale. Preface de M. Anatole Leroy-Beaulieu. Paris, 1906.

(8) Steinmetz, S. R. _Der Krieg als sociologisches Problem._ Pp. 21 ff.

Amsterdam, 1899.

(9) ----. _Die Philosophie des Krieges._ "Natur- und kultur-philosophische Bibliothek," Band VI. Leipzig, 1907.

(10) Constantin, A. _Le role sociologique de la guerre et le sentiment national._ Suivi de la guerre comme moyen de selection collective, par S. R. Steinmetz. "Bibliotheque scientifique internationale," Tome CVIII.

Paris. 1907.

(11) Keller, Albert G. _Through War to Peace._ New York, 1918.

(12) Worms, Rene, editor. "Les luttes sociales." etudes et paroles de E.

Leva.s.seur, Lord Avebury, Rene Worms, J. Novicow, Lester F. Ward, A. P.

Xenopol, Louis Gumplowicz, Ferdinand Tonnies, Raoul de la Gra.s.serie, Simon Halpercine, Ludwig Stein, emile Worms, Charles M. Limousin, Frederick Harrison, C. L. Loch, G. Arcoleo, R. Garofalo, J. K.

Kochanowski, Leon Phillipe, Alfredo Niceforo, N. A. Abrikossof, Adolphe Landry. _Annales de l'inst.i.tut international de sociologie._ Tome XI.