This study of Environment, Race, and Migration is in a sense a new edition of the writer's book Environment and Race, published in 1927. But so much new material has been added that it was deemed advisable to indicate these additions by a slight change in the title. Among the 158 maps in the present volume, 100 did not appear in the 1927 book. The section on the environmental control of modern migrations has been greatly increased. Five new chapters deal with settlement in Canada, and constitute one of the first modern geographical studies of the whole Dominion. Two of the chapters on Australia are new, and a good deal more emphasis has been laid on new settlement in Siberia and Africa. The fundamental factors of structure, climate, and changing environment are also more fully explained for each continent.