In this volume, the product of decades of study and research, the world's foremost geneticist surveys the major developments in what is emerging as the most important single area of scientific inquiry in the twentieth century: biological theory of evolution in particular.

Noting that the theory of evolution in biology is more than a century old, Dr. Dobzhansky points out that it is nevertheless only in recent times that our knowledge of its physical basis as well as our understanding of its dynamics has progressed greatly. Yet, he notes, new problems have replaced the older ones at the...