 At Montevideo in November the mail from home included a copy of the second volume of Charles Lyell's "Principles of Geology", a refutation of Lamarckism in which there was no shared ancestry of different species or overall progress to match the gradual geological change, but a continuing cycle in which species mysteriously appeared, closely adapted to their "centres of creation", then became extinct when the environment changed to their disadvantage.They reached Tierra del Fuego on 18 December 1832 and Darwin was taken aback at what he perceived as the crude savagery of the Yaghan natives, in stark contrast to the "civilised" behaviour of the three Fuegians they were returning as missionaries (who had been given the names York Minster, Fuegia Basket and Jemmy Button).He described his first meeting with the native Fuegians as being "without exception the most curious and interesting spectacle I ever beheld