On reliving theWanderjahr: The many voyages of theBeagle

This is a study of constancy and change in the development of one adult's system of beliefs and way of thought. It compares two documents, two versions of Charles Darwin's account of the voyage of theBeagle, one written at an early stage in the development of his evolutionary thought, the other much later but still long before he wrote theOrigin of the Species. The second version was produced 7 years after Darwin developed the theory of evolution through natural selection. Although no explicit reference is made to that theory, both versions exhibit a style of thought and a pattern of beliefs that remained very stable throughout. Examination of the documents reveals 13 major themes: relation between food supply and population; struggle; extinction; the superfecundity of nature; the tangled bank; selection; variation and divergence; the law of the succession of types; biogeography; strange contrivances, maladaptations, and rudimentary organs; human imperfections and perfectibility; the transformation of creation; and psychology. The study concludes with a discussion of the relation between private thought and public discourse, and the bearing of this relationship on exchanges between Charles Darwin and Alfred Russel Wallace.