What are the motifs in The Voyage of the Beagle by Charles Darwin?

Corage is a motif throughout the book. Darwin does not address his periods of anxiety directly. The reader can assume entering a jungle known to contain highly poisonous snakes and cannibals would take a good deal of courage, or perhaps the daring of youth. Pushing into a miserable land and coming up with very few worthwhile observations likely brings on an amount of depression.