This nonfiction work delves into the heart of evolutionary theory, examining how scientists argue about the connections between germ-plasm, somatic inheritance, and the environments that shape living forms. It traces the limits of inherited material and the ways organs and organisms unfold under internal powers, using concrete examples like eye development to illustrate how different body parts can form from multiple tissue sources. The text also weighs Lamarckian ideas against the challenges of explaining complex traits, degeneration, and adaptation without overreaching what observation can confirm.

Understand major questions about inheritance, germ-plasm, and the role of the environment in evolution.
See how scientists use concrete anatomical examples to test broad theories.
Learn why debates on naturalism, realism, and mechanism matter for interpreting biological change.
Get a clear sense of how reasoning about evolution has evolved alongside new evidence and philosophical considerations.

Ideal for readers of scientific philosophy and students curious about the debates shaping evolutionary theory.

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