".... differences among individuals and groups fur- nish the leaven of creative effort which carries mankind toward ever greater achievements."
This is an up-to-date, revised and expanded edition of an exciting, important book. It demonstrates what men must know if they are to survive in today's world.
L. C. DUNN has been a professor of Zo- ology at Columbia University since 1928. For many years he has devoted himself to a study of the ways in which heredity affects the development of the individ- ual. He is the author (with E. W. Sinnott) of a standard textbook, Principles of Genetics, and of Heredity and Varia- tion. He is a member of the Norwegian Academy of Science, the American Philosophical Society and the National Academy of Sciences.
THEODOSIUS DOBZHANSKY is a Pro- fessor of Zoology at Columbia University and has been concerned chiefly with problems of genetics and evolution. He is the author of Genetics and the Origin of Species, which received the Daniel Giraud Elliot medal of the National Academy of Sciences. He is a member of the American Philosophical Society and the National Academy of Sciences