Chapter XII

Darwin notes that after Tierra del Fuego, Valparaiso's dry, clear climate feels delightful, and the town's setting at the foot of hills with distant views of the Andes creates a pleasant landscape.

Darwin describes the town's layout along the beach with houses in ravines, reddish soil, and whitewashed buildings, noting its resemblance to Teneriffe and the impressive distant views of Aconcagua volcano.

Darwin explains that Valparaiso's steady southwesterly winds prevent summer rain, creating scanty vegetation, while the contrast with forested regions 350 miles south demonstrates climate's dramatic effect on plant life.

Darwin observes shell beds at Quintero several hundred feet above sea level, with shells found even at 1300 feet, providing unequivocal proof of coastal elevation; he notes the marine mud appears to be vegetable mould under the microscope.

Darwin contrasts the verdant, irrigated Quillota Valley with the arid lands near Valparaiso, describing it as a pastoral landscape with gardens, orchards, and flat terrain that supports agriculture.

Darwin proposes that the level basins and flat valleys throughout Chile represent the bottoms of ancient bays and inlets, similar to current Tierra del Fuego geography, inferring that Chile formerly resembled a more archipelagic landscape.

Darwin describes how fog banks settling over the landscape visually represent former bays and coves, with isolated hills appearing as former islets, providing striking confirmation of his geological hypothesis.

Darwin's climb to 6400 feet reveals subtropical vegetation changes with elevation and interesting geological features, including observations of palms and bamboo at varying heights.

Darwin describes the large-stemmed palm trees found in Chile, their value for producing treacle from sap, and the curious phenomenon that sap flows better when the tree falls uphill rather than downslope.

Darwin notes that ship masts in Valparaiso bay are visible from 26 miles away due to the mountain height and air clarity, explaining why Anson was surprised by this phenomenon in his voyage.

Darwin observes that the summit rocks show varying degrees of freshness, from recently broken to lichen-covered, and initially attributes this to frequent earthquakes, but later verifies this is a natural weathering pattern.

Darwin expresses wonder at the vast forces required to uplift the Andes and the enormous timescales necessary for their formation, invoking the erosion of Patagonian sediments as perspective on geological time.

Darwin describes the Andes as appearing like a solid wall with a horizontal snow line, punctuated by volcanic cones and towers, creating a perfect natural barrier.

Darwin contrasts the more civilized Guasos with the independent Gauchos, noting class consciousness among Guasos, their different attire, work habits, and dietary preferences, demonstrating how civilization produces social hierarchy.

Darwin describes copper mines that operate quietly without smelting furnaces in Chile, contrasting them with English operations, and notes that ore is shipped to Swansea for processing.

Darwin records that English miners introduced roasting copper pyrites before smelting and reprocessing old furnace waste, overcoming Chilean miners' false belief that the ore was worthless.

Darwin documents that miners work from dawn to dark with only one pound sterling monthly pay plus minimal food, while underground miners receive slightly more but return home only bi-weekly.

Darwin notes that shattered rocks with greenstone dykes reveal past violent geological activity, and describes the sparse, dry vegetation with large opuntia cacti that can reach 15 feet in height.

Darwin attempts to reach a lake locals believed connected to the Pacific Ocean, but becomes lost in snow drifts and must return, narrowly avoiding danger as a storm approaches.

Darwin approaches Santiago across a plain with acacia trees and is struck by the city's dramatic setting against the Andes, with the dead-level surface and snowy peaks suggesting a former inland sea.

Darwin spends a week in Santiago enjoying English hospitality and ascending St. Lucia hillock for striking views, noting the city's similarity to Buenos Aires.

Darwin describes precarious stick-bundle bridges suspended by hide ropes that oscillate dangerously even under light weight, demonstrating primitive Chilean engineering.

Darwin examines hot springs issuing from a line of dislocation in stratified rock, noting their different temperatures result from unequal cold water mixture, and their disturbance by earthquakes.

Darwin documents the paradoxical observation that spring water is hotter and more plentiful in summer despite being a dry season, hypothesizing this results from distant snow-melt percolating through porous strata.

Darwin recounts the story of Pincheira, a renegade half-caste who led Indian forces across previously untried Cordillera passes to raid farms and steal cattle, establishing a secret base.

Darwin observes 450-foot deep gold mines where young men carry 200-pound stone loads up notched tree shafts with minimal food and pay, working under harsh conditions that prioritize theft prevention.

Darwin describes the grinding, washing, and amalgamation processes that separate gold from matrix, and the chemical action in settling pools that liberates additional gold even years later.

Darwin draws a parallel between miners scraping ground for gold particles and nature's grinding of mountains, where durable metals like gold accumulate after rock degradation and oxidation.

Darwin explains that landowners grant small plots to laborers in exchange for lifetime service without wages, creating systematic poverty worse than mining conditions.

Darwin examines perforated circular stones from Indian ruins and proposes, based on African parallels, that they were weights for digging sticks used as agricultural tools.

Darwin relates anecdotes of Chileans questioning why the King would send collectors for supposedly worthless specimens and of Renous being arrested for supposedly heretical caterpillar breeding.

Darwin observes vast plains without trees south of Santiago with flat-bottomed valleys and sea caves, indicating the land was shaped by marine action similar to Patagonia.

Darwin becomes seriously ill during the journey and remains bedridden in Valparaiso through October, hosted by Corfield whose kindness he greatly appreciated.

Darwin notes the puma ranges from equatorial forests to Tierra del Fuego and high Andes elevations, with its prey and hunting behavior varying by region.

Darwin describes how pumas cover kills with bushes and watch them, attracting condors whose circling behavior alerts hunters to the puma's presence.

Darwin explains that pumas are entangled with bolas, lazoed, and dragged until insensible, with records of large-scale killings and specialized leonero dogs used in Chilean hunts.

Darwin describes the Turco as a ground-dwelling bird with stilt-like legs and erect tail that hops rather than runs, produces strange cries, and has a muscular gizzard adapted for grinding tough food.

Darwin describes the Tapacolo as a small bird with an exaggerated tail carried backward, very common in bushes, crafty in avoiding detection, and producing diverse strange sounds that vary seasonally.

Darwin notes that Trochilus forficatus ranges 2500 miles from Lima to Tierra del Fuego, being especially abundant in humid Chiloe, while a larger species replaces it seasonally from the north.

Darwin describes the larger Trochilus gigas's powerful wing movements during hovering, tail expansion for balance, and predominantly insectivorous diet despite feeding on flowers.

Darwin notes that Molina omitted Pteroptochos species despite their abundance and remarkable habits, speculating whether classification difficulties led to this silence.