The diversity of living forms and the unity of evolutionary processes are themes that have permeated the research and writing of Ernst Mayr, a Grand Master of evolutionary biology. The essays collected here are among his most valuable and durable: contributions that form the basis for much of the contemporary understanding of evolutionary biology.

Ernst Mayr is Alexander Agassiz Professor of Zoology, Emeritus, at Harvard University. He is also the recipient of numerous honorary degrees and awards, including the Crafoord Prize for Biology, the National Medal of Science, the Balzan Prize, and the Japan Prize.

Read More by Ernst Mayr:

• This Is Biology: The Science of the Living World
• The Growth of Biological Thought: Diversity, Evolution, and Inheritance
• One Long Argument: Charles Darwin and the Genesis of Modern Evolutionary Thought
• Populations, Species, and Evolution, An Abridgment of <i>Animal Species and Evolution</i>
• Toward a New Philosophy of Biology: Observations of an Evolutionist
• The Evolutionary Synthesis: Perspectives on the Unification of Biology, With a New Preface
• Systematics and the Origin of Species from the Viewpoint of a Zoologist
• Animal Species and Evolution