The notebooks trace Darwin's work immediately prior to his coining of the term "natural selection" in 1842, up to the publication of On the Origin of the Specie

The notebooks trace Darwin's work immediately prior to his coining of the term "natural selection" in 1842, up to the publication of On the Origin of the Species in 1859. The notebooks were digitized one page at a time—over 12,000 in all—and are made available online at Cambridge Digital Library