Context:

Darwin purchased this book before his voyage on the Beagle. Tom describes it as a groundbreaking text that argues geological change happens through slow processes rather than biblical floods and apocalypses, which influenced Darwin's thinking about evolution.

Context:

Dominic recommends these naval novels to Tom, comparing the Darwin-Fitzroy relationship to the characters in O'Brian's books. He suggests Tom should make reading them a New Year's resolution.

Context:

Tom mentions that Darwin wrote up his voyage as a book, calling it 'a great book.' Fitzroy also wrote an account of the voyage.

Context:

Tom explicitly recommends this biography as his source for the Darwin information in the episode, calling it 'not just the best biography of Darwin' but 'one of the great, you know, all-time biographies.'