OCIAL DIRECTION OF HUMAN EVOLUTION, by W. E. Kellicott.
New York, 1911.

THE PHYSICAL BASIS OF SOCIETY, by Carl Kelsey. New York, D.
Appleton & Co., 1916.

EUGENICS, by Edward Schuster. Collins' Clear Type Press, London
and Glasgow, 1913.

HEREDITY, by J. Arthur Thompson. Edinburgh, 1908.

GENETICS, by Herbert E. Walter. The Macmillan Co., New York,
1913.

AN INTRODUCTION TO EUGENICS, by W. C. D. Whetham and C. D.
Whetham. Macmillan and Co., London, 1912.

HEREDITY AND SOCIETY, by W. C. D. Whetham and C. D. Whetham.
Longmans, Green & Co., London, 1912.

THE FAMILY AND THE NATION, by W. C. D. Whetham and C. D.
Whetham. Longmans, Green & Co., London, 1909.

The publications of the Galton Laboratory of National Eugenics,
University of London, directed by Karl Pearson, and of the Eugenics
Record Office, Cold Spring Harbor, Long Island, N. Y., directed by C. B.
Davenport, furnish a constantly increasing amount of original material
on heredity.

The principal periodicals are the _Journal of Heredity_ (organ of the
American Genetic Association), 511 Eleventh St., N. W., Washington, D.
C. (monthly); and the _Eugenics Review_ (organ of the Eugenics Education
Society), Kingsway House, Kingsway, W. C., London (quarterly). These
periodicals are sent free to members of the respective societies.
Membership in the American organization is $2 a year, in the English 1
guinea a year, associate membership 5 shillings a year.

APPENDIX F

GLOSSARY

ACQUIRED CHARACTER, a modification of a germinal trait after
cell fusion. It is difficult to draw a line between characters that are
acquired and those that are inborn. The idea involved is as follows: in
a standard environment, a given factor in the germ-plasm will develop
into a trait which varies not very widely about a certain mean. The mean
of this trait is taken as representing the germinal trait in its typical
condition. But if the environment be not standard, if it be considerably
changed, the trait will develop a variation far from the mean of that
trait in the species. Thus an American, whose skin in the standard
environment of the United States would be blonde, may under the
environment of Cuba develop into a brunette. Such a wide variation from
the mean thus caused is called an acquired character; it is usually
impressed on the organism after the germinal trait has reached a full,
typical development.

ALLELOMORPH (one another form), one of a pair of factor