Ernst Mayr was Alexander Agassiz Professor of Zoology, Emeritus, at Harvard University. He was 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.

[This book] should be read by all biologists, professional and amateur.

• Foreword by Theodosius Dobzhansky Preface Introduction, 1999 Introduction by Niles Eldredge I. The Methods and Principles of Systematics II. Taxonomic Characters and Their Variation III. Phenomena of Geographic Variation IV. Some Aspects of Geographic Variation V. The Systematic Categories and the New Species Concept VI. The Polytypic Species, In Nature and in Systematics VII. The Species in Evolution VIII. Nongeographic Speciation IX. The Biology of Speciation X. The Higher Categories and Evolution Literature Index

Ernst Mayr was Alexander Agassiz Professor of Zoology, Emeritus, at Harvard University. He was 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.

[This book] should be read by all biologists, professional and amateur.

• Foreword by Theodosius Dobzhansky Preface Introduction, 1999 Introduction by Niles Eldredge I. The Methods and Principles of Systematics II. Taxonomic Characters and Their Variation III. Phenomena of Geographic Variation IV. Some Aspects of Geographic Variation V. The Systematic Categories and the New Species Concept VI. The Polytypic Species, In Nature and in Systematics VII. The Species in Evolution VIII. Nongeographic Speciation IX. The Biology of Speciation X. The Higher Categories and Evolution Literature Index

Ernst Mayr was Alexander Agassiz Professor of Zoology, Emeritus, at Harvard University. He was 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.

[This book] should be read by all biologists, professional and amateur.

• Foreword by Theodosius Dobzhansky Preface Introduction, 1999 Introduction by Niles Eldredge I. The Methods and Principles of Systematics II. Taxonomic Characters and Their Variation III. Phenomena of Geographic Variation IV. Some Aspects of Geographic Variation V. The Systematic Categories and the New Species Concept VI. The Polytypic Species, In Nature and in Systematics VII. The Species in Evolution VIII. Nongeographic Speciation IX. The Biology of Speciation X. The Higher Categories and Evolution Literature Index