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Fig. 22-2

American Revolution

French Revolution

U.S. Civil War

1900

1850

1800

1750

1795

1809

1798

1830

1831–1836

1837

1859

1837

1844

1858

The Origin of Species is published.

Wallace sends his hypothesis to Darwin.

Darwin begins his notebooks.

Darwin writes essay on descent with modification.

Darwin travels around the world on HMS Beagle.

Malthus publishes “Essay on the Principle of Population.”

Lyell publishes Principles of Geology.

Lamarck publishes his hypothesis of evolution.

Hutton proposes his theory of gradualism.

Linnaeus (classification)

Cuvier (fossils, extinction)

Malthus (population limits)

Lamarck (species can change)

Hutton (gradual geologic change)

Lyell (modern geology)

Darwin (evolution, natural selection)

Wallace (evolution, natural selection)

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