 At the age of 22, the graduate Charles Darwin hoped to see the tropics before becoming a parson, and accepted the opportunity.He was greatly influenced by reading Charles Lyell's "Principles of Geology" during the voyage.By the end of the expedition, Darwin had already made his name as a geologist and fossil collector, and the publication of his journal which became known as "The Voyage of the Beagle" gave him wide renown as a writer.