ng, its
relation to scientific knowledge, and its bearings on the problems of
natural and rational causation. London, 1913.

(11) Weigall, A. "The Influence of the Kinematograph upon National
Life," _Nineteenth Century and After_, LXXXIX (April, 1921), 661-72.

III. MATERIALS FOR THE STUDY OF MOBILITY

(1) Vallaux, Camille. "Le sol et l'etat," _Geographie sociale._ Paris,
1911.

(2) Demolins, Edmond. _Comment la route cree le type social._ Les
grandes routes des peuples; essai de geographie social. 2 vols. Paris,
1901.

(3) Vandervelde, E. _L'exode rural el le retour aux champs._ Chap. iv,
"Les consequences de l'exode rural." (Sec. 3 discusses the political and
intellectual, the physical and moral consequences of the rural exodus,
pp. 202-13.) Paris, 1903.

(4) Bury, J. B. _A History of Freedom of Thought._ London and New York,
1913.

(5) Bloch, Iwan. _Die Prostitution._ Handbuch der gesamten
Sexualwissenschaft in Einzeldarstellungen. Berlin, 1912.

(6) Pagnier, Armand. _Du vagabondage et des vagabonds._ Etude
psychologique, sociologique et medico-legale. Lyon, 1906.

(7) Laubach, Frank C. _Why There Are Vagrants._ A study based upon an
examination of one hundred men. New York, 1916.

(8) Ribton-Turner, Charles J. _A History of Vagrants and Vagrancy and
Beggars and Begging._ London, 1887.

(9) Florian, Eugenio. _I vagabondi._ Studio sociologicoguiridico. Parte
prima, "L'Evoluzione del vagabondaggio." Pp. 1-124. Torino, 1897-1900.

(10) Devine, Edward T. "The Shiftless and Floating City Population,"
_Annals of the American Academy of Political and Social Science_, X
(September, 1897), 149-164.

IV. SOCIAL CONTACTS IN PRIMARY GROUPS

(1) Sumner, Wm. G. _Folkways._ A study of the sociological importance of
usages, manners, customs, mores, and morals. "The In-Group and the
Out-Group," pp. 12-16. Boston, 1906.

(2) Vierkandt, Alfred. _Naturvoelker und Kulturvoelker._ Ein Beitrag zur
Socialpsychologie. Leipzig, 1896.

(3) Pandian, T. B. _Indian Village Folk._ Their Works and Ways. London,
1897.

(4) Dobschuetz, E. v. _Die urchristlichen Gemeinden._
Sittengeschichtliche Bilder. Leipzig, 1902.

(5) Kautsky, Karl. _Communism in Central Europe in the Time of the
Reformation._ Translated by J. L. and E. G. Mulliken. London, 1897.

(6) Hupka, S. von. _Entwicklung der westgalizischen Dorfzustaende in der
2. Haelfte des 19. Jahrhunderts, verfolgt in einem Doerferkomplex._
Zuerich, 1910.

(7) Wallace, D