Kraft in der
Geschichte," _Jahrbuecher fuer National-Oekonomie und Statistik_, XIII
(1897), 880-900.

(9) Barth, Paul. _Philosophie der Geschichte als Sociologie_. Erster
Teil, "Einleitung und kritische Uebersicht." Leipzig, 1897.

(10) Rickert, Heinrich. _Die Grenzen der Naturwissenschaftlichen
Begriffsbildung_. Leipzig, 1902.

(11) Simmel, Georg. _Die Problems der Geschichtsphilosophie_. Eine
erkenntnistheoretische Studie. 2d ed. Leipzig, 1905.

(12) Mill, John Stuart. _A System of Logic, Ratiocinative and
Inductive_. Being a connected view of the principles of evidence and the
methods of scientific investigation. 8th ed. New York and London, 1900.

(13) Letelier, Valentin. _La Evolucion de la historia_. 2d ed. 2 vols.
Santiago de Chile, 1900.

(14) Teggart, Frederick J. _The Processes of History._ New Haven, 1918.

(15) Znaniecki, Florian. _Cultural Reality._ Chicago, 1919.

(16) Hibben, J. G. "The Philosophical Aspects of Evolution,"
_Philosophical Review_, XIX (1910), 113-36.

(17) Bagehot, Walter. _Physics and Politics._ Or thoughts on the
application of the principles of "natural selection" and "inheritance"
to political society. Chap. vi, "Verifiable Progress Politically
Considered," pp. 205-24. New York, 1906.

(18) Crawley, A. E. "The Unconscious Reason in Social Evolution,"
_Sociological Review_, VI (1913), 236-41.

(19) Froude, James A. "Essay on Progress," _Short Studies on Great
Subjects._ 2d Ser. II, 245-79, 4 vols. New York, 1888-91.

(20) Morley, John. "Some Thoughts on Progress," _Educational Review_,
XXIX (1905), 1-17.

III. EVOLUTION AND PROGRESS

(1) Spencer, Herbert. "Progress, Its Law and Cause," _Westminster
Review_, LXVII (1857), 445-85. [Reprinted in Everyman's edition of his
_Essays_, pp. 153-97. New York, 1866.]

(2) Federici, Romolo. _Les Lois du Progres._ II, 32-35, 44, 127, 136,
146-47, 158 ff., 223, etc. 2 vols. Paris, 1888-91.

(3) Baldwin, James Mark. _Development and Evolution._ Including
psychophysical evolution, evolution by orthoplasy, and the theory of
genetic modes. New York, 1902.

(4) Adams, Brooks. _The Law of Civilization and Decay._ An essay on
history. New York and London, 1903.

(5) Kidd, Benjamin. _Principles of Western Civilization._ London, 1902.

(6) ----. _Social Evolution._ New ed. New York and London, 1896.

(7) Mueller-Lyer, F. _Phasen der Kultur und Richtungslinien des
Fortschritts._ Soziologische Ueberblicke. Muenchen, 1908.

(8) McGee