3: 6; October 7, 1917, 111, 10: 1; January 21, 1919, 3: 6; June
14, 1919, 3: 6; June 16, 1919, 12: 5; June 11, 1920, 18: 1; December
12, 1921, 14: 1); H. B. Pendleton, "Cotton Pickers in Northern Cities"
(_Survey_, 37: 569-71, February 17, 1917); W. O. Scroggs, "Interstate
Migration of Negroes" (_Journal of Political Economy_, 25: 1034-43,
December, 1917); "The Lure of the North for Negroes" (_Survey_, 38:
27-28, April 7, 1917); "Reasons why Negroes go North" (_Survey_, 38:
226-7, June 2, 1917); "Negro Migration as the South sees It"
(_Survey_, 38: 428, August 11, 1917); "Health of the Negro" (_Survey_,
42: 596-7, June 19, 1919); "Negroes in Industry" (_Survey_, 42: 900,
September 27, 1919); "A New Migration" (_Survey_, 45: 752, February
26, 1921); F. B. Washington, "The Detroit New Comers' Greeting"
(_Survey_, 38: 333-5, July 14, 1917); W. F. White, "The Success of
Negro Migration" (_The Crisis_, 19: 112-15, January, 1920); T. J.
Woofter, Jr., "The Negro and Industrial Peace" (_Survey_, 45: 420-421,
December 17, 1921); J. A. Wright, "Conditions among Negro Migrants in
Hartford, Connecticut" (a letter).

The following pamphlets and reports were also valuable: Branson and
others, _Migration, Minutes of University Commission on Southern Race
Questions_, pp. 48-49, 1917; Bureau of the United States Census,
_Negro Population in the United States, 1790-1916_, and _Negroes in
the United States_, Bulletin 129: A. Epstein, _The Negro Migrant in
Pittsburg_; G. E. Haynes, _Negro New-comers in Detroit, Michigan_;
Home Mission Council, _The Negro Migration_; E. K. Jones, _The Negro
in Industry, Proceedings of the National Conference of Social Work_,
pp. 494-503, June, 1917; United States Department of Labor, _Negro
Migration in 1916-17_, and _The Negro at Work during the War and
Reconstruction_.

[2] A full list of these occurs in the bibliographical section of this
essay.

[3] Chapin, F. S., _Introduction to the Study of Human Evolution_, pp.
30-31.

[4] This law, of course, does not fully operate among men in a highly
civilized state of living, for in this state its force is much
diminished by various uplift, or counter-selective, agencies.

[5] Gregory, Keller, and Bishop, _Physical and Commercial Geography_,
pt. II, p. 126.

[6] Gregory, Keller, and Bishop, _Physical and Commercial Geography_,
pt. II, p. 126.

[7] Keller, A. G., _Societal Evolution_, pp. 24-37.

[8] What is said here, and also in the remaining pages