In 1936, nearly ten years after his Russian emigration, Theodosius Dobzhansky attempted the first synthesis of evolutionary semantics and experimental genetics. His lectures at Columbia University from that time became Genetics and the Origin of Species- a long argument for a general attitude toward nature and a specific approach that unified the disparate elements of evolutionary theory.

• Organic Diversity Gene Mutation Mutation as a Basis for Racial and Specific Differences Chromosomal Changes Variation in Natural Populations Selection Polyploidy Isolating Mechanisms Hybrid Sterility Species as Natural Units Literature Index