iation for the Study and Prevention
of Tuberculosis_, p. 117.

[61] _Geographical and Historical Pathology_ (New Sydenham Society,
1883), Vol. III, p. 266.

[62] Reid, G. Archdall, _The Present Evolution of Man_, and _The Laws of
Heredity_.

[63] _In the South Seas,_ p. 27; quoted by G. Archdall Reid, _The
Principles of Heredity_ (New York, 1905), p. 183. Dr. Reid has discussed
the role of disease and alcohol on the modern evolution of man more
fully than any other writer.

[64] See, for example, John West's _History of Tasmania_, Vol. II,
Launceston, Tasmania, 1852.

[65] See Hollingworth, H. L., _Vocational Psychology_, p. 170, New York,
1916.

[66] Net increase here refers only to the first year of life, and was
computed by deducting the deaths under one year, in a ward, from the
number of births in the same ward for the same year. For details of this
study of the Pittsburgh vital statistics, see the _Journal of Heredity_,
Vol. VIII, pp. 178-183 (April, 1917).

[67] Quoted from Newsholme and Stevenson, _The Decline of Human
Fertility_, London, 1906.

[68] Heron, David, _On the Relation of Fertility in Man to Social
Status_, London, 1906. The account is quoted from Schuster, Edgar,
_Eugenics_, pp. 220-221, London, 1913.

[69] _Ztschft. f. Sozialwissenschaft,_ VII (1904), pp. 1 ff.

[70] Two of the best known of these tribes are the "Jukes" and "Nams."
"An analysis of the figures of the Jukes in regard to the birth-rate
shows that of a total of 403 married Juke women, 330 reproduced one or
more children and 73 were barren. The average fecundity, counting those
who are barren, is 3.526 children per female. The 330 women having
children have an average fecundity of 4.306 as compared with that of
4.025, based on 120 reproducing women in the Nam family."--Estabrook, A.
H., _The Jukes in 1915_, p. 51, Washington, Carnegie Institution, 1916.

[71] Woods, Frederick Adams, _Heredity in Royalty_, New York, 1906.

[72] Beeton, Miss M., Yule, G.U., and Pearson, Karl, _On the Correlation
between Duration of Life and the Number of Offspring_, Proc. R. S.
London, 67 (1900), pp. 159-171. The material consisted of English and
American Quaker families. Dr. Bell's work is based on old American
families, and has not yet been published.

[73] The entire field of race betterment and social improvement is
divided between _eugenics_, which considers only germinal or heritable
changes in the race; and _euthenics_, which deals