Abstract

A new picture is emerging from the last hundred years’ study of evolution. Mountains of data to support—or bury—perspective are available, and there have been some substantial, recent summative works. Darlington in particular is recognized not only for comprehensiveness and insight, but for wit and clarity as well. Dobzhansky has done a rather lucid summary in nontechnical language, and Rensch has constructed a monument of documentation and intricate interpretation. Nevertheless, the picture of evolution has changed far more drastically than most professionals can grasp without thoroughly digesting and independently interpreting a host of summative literature. The war-of-all-against-all, which is still evolution for the layman, has long since given away to the ecologist’s community with its various kinds of relationships. Therefore, the concept of “Biological Expansion” is now felt to be a more adequate frame of reference.