The Silliman Lectures at Yale University have been responsible for many books which have greatly influenced the progress of scientific work in the twentieth century. One of the foremost scientists of our time, Theodosius Dobzhansky, recipient of the Elliot and Kimbler prizes, and Da Costa Professor of Zoology at Columbia University, delivered the Silliman Lectures given in honor of the Centennial of Charles Darwins On the Origin of Species. Based upon these lectures, Mr. Dobzhanskys latest book, Mankind Evolving, now takes its place beside his other great works. With a profound knowledge of the biological theory of evolution and modern genetics, Mr. Dobzhansky explores the possibilities of understanding mankind as a product of evolution and as an evolving whole. Human evolution, contends Mr. Dobzhansky, cannot be understood as a purely biological process, nor can it be adequately described as a history of culture; rather, it is the interaction between the two components of evolutionthe biological, or organic, and the cultural, or superorganic. The interdependence of these two components is brought
