(22) Johnson, James W. _The Autobiography of an ex-Colored Man._ Published anonymously. Boston, 1912.
(23) Washington, Booker T. _Up from Slavery._ An autobiography. New York, 1901.
(24) Du Bois, W. E. B. _The Souls of Black Folk._ Chicago, 1903.
(25) Beers, C. W. _A Mind That Found Itself._ An autobiography. 4th rev. ed. New York, 1917.
A. _The Nature of Individual Differences_
(1) Thorndike, E. L. _Individuality._ Boston, 1911.
(2) ----. "Individual Differences and Their Causes," _Educational Psychology_, III, 141-388. New York, 1913-14.
(3) Stern, W. _Ueber Psychologie der individuellen Differenzen._ Leipzig, 1900.
(4) Hollingworth, Leta S. _The Psychology of Subnormal Children._ Chap. i. "Individual Differences." New York, 1920.
(1) Goddard, H. H. _Feeble-mindedness._ Its causes and consequences. New York, 1914.
(2) Tredgold, A. F. _Mental Deficiency._ 2d ed. New York, 1916.
(3) Bronner, Augusta F. _The Psychology of Special Abilities and Disabilities._ Boston, 1917.
(4) Healy, William. _Case Studies of Mentally and Morally Abnormal Types._ Cambridge, Mass., 1912.
(1) Fouillée, A. _Tempérament et caractère selon les individus, les sexes et les races._ Paris, 1895.
(2) Hirt, Eduard. _Die Temperamente, ihr Wesen, ihre Bedeutung, für das seelische Erleben und ihre besonderen Gestaltungen._ "Grenzfragen des Nerven- und Seelenlebens," No. 40. Wiesbaden, 1905.
(3) Hoch, A., and Amsden, G. S. "A Guide to the Descriptive Study of Personality," _Review of Neurology and Psychiatry_, (1913), pp. 577-87.
(4) Kraepelin, E. _Psychiatrie._ Ein Lehrbuch für Studierende und Ärzte. Vol. IV, chap. xvi, pp. 1973-2116. 8th ed. 4 vols. Leipzig, 1909-15.
(5) Loewenfeld, L. _Ueber die geniale Geistesthätigkeit mit besonderer Berücksichtigung des Genie's für bildende Kunst._ "Grenzfragen des Nerven- und Seelenlebens," No. 21. Wiesbaden, 1903.
(1) Lombroso, C. _The Man of Genius._ Translated from the Italian. London and New York, 1891.
(2) ----. _L'uomo delinquente in rapporto all'antropologia, alla giurisprudenza ed alle discipline carcerarie._ 3 vols. 5th ed. Torino, 1896-97.
(3) Goring, Charles. _The English Convict._ A statistical study. London, 1913.
(4) Wilmanns, Karl. _Psychopathologie des Landstreichers._ Leipzig, 1906.