The Voyage of the Beagle · Chapter
Passage of the Cordillera explained
Darwin describes his journey across the Andes via the Portillo and Uspallata passes, detailing the geological structure, the extreme barrenness, the sagacity of mules, the dangers of mountain torrents, and the discovery of silicified trees.
What happens
Darwin describes his journey across the Andes via the Portillo and Uspallata passes, detailing the geological structure, the extreme barrenness, the sagacity of mules, the dangers of mountain torrents, and the discovery of silicified trees. He reflects on the gradual elevation and subsidence of the Cordillera, the effects of snow on rocks, and the unique atmospheric conditions at high altitudes, including red snow and the sensation of puna (altitude sickness).
Themes in this chapter
Geological Uniformitarianism
Darwin observes the layered strata, volcanic rocks, and fossil shells, interpreting them as evidence of gradual geological processes over immense timescales.
Exploration and Discovery
Darwin's crossing of the Cordillera involves navigating treacherous passes, observing unique natural phenomena like red snow, and collecting geological specimens.
Human Impact on Environment
The barren landscape and scarcity of vegetation highlight the harsh conditions and limited human habitation in the high Andes.
Characters to notice
- Captain Fitz Roy
Hails an American whaler near Concepcion to anchor safely.
- Mr. Caldcleugh
Assists Darwin in Santiago with preparations for crossing the Andes.
Key passages
“I saw that they had sprung from a volcanic soil which had been raised above the level of the sea, and that subsequently this dry land, with its upright trees, had been let down into the depths of the ocean.”
Darwin realized the mountains originated from volcanic land that rose from the sea, then sank back underwater with trees still standing.
Illustrates the cycle of uplift and subsidence in the Andes.
“The only sensation I experienced was a slight tightness across the head and chest, like that felt on leaving a warm room and running quickly in frosty weather.”
Darwin felt only mild altitude sickness, comparable to the feeling of stepping from a warm room into cold air and running.
Describes the puna or altitude sickness at high elevations.
“I felt glad that I was alone: it was like watching a thunderstorm, or hearing in full orchestra a chorus of the Messiah.”
Darwin appreciated the solitude, comparing the majestic mountain view to a thunderstorm or a powerful musical performance.
Expresses the sublime experience of the Andean landscape.