40 : 27. Ellsworth Huntington, 1, pp. 14, 27.
41 : 25–42. G. Retzius, On the So-called North European Race of Mankind, p. 300; and many other authorities.
43 : 23. Ripley, pp. 352 seq. and 470.
44 : 17. G. Elliot Smith, 1, p. 61; G. Sergi, 4.
44 : 26. Ripley, pp. 443 and 582–583.
45 : 2. Beddoe, 4, p. 270.
CHAPTER IV. THE COMPETITION OF RACES
47 : 17. Prescott F. Hall, Immigration Restriction and World Eugenics.
49 : 15–51. See the Eugenics Record Office Bulletins, 10A and 10B, by Harry H. Laughlin, Cold Spring Harbor, Long Island. Part I is “The Scope of the Committee’s Work”; Part II, “The Legal, Legislative and Administrative Aspects of Sterilization.” See also H. H. Hart, Sterilization as a Practical Measure; and Raymond Pearl, The Sterilization of Degenerates; as well as The Eugenical News for April, May and August, 1918.
52 : 17. Sir Francis Galton, Hereditary Genius, pp. 351–359; Darwin, The Descent of Man, p. 218.