Introduction / by Theodosius Dobzhansky -- The methods and principles of systematics -- Taxonomic characters and their variation -- Phenomena of geographic variation -- Some aspects of geographic variation -- The systematic categories and the new species concept -- The polytypic species, in nature and in systematics -- The species in evolution -- Nongeographic speciation -- The biology of speciation -- The higher categories and evolution
Notes
"Corrected republication of the work first published by the Columbia University Press in 1942, to which has been added a new preface by the author"--Verso of title page
Bibliography
Includes bibliographical references (pages 299-314) and index