Despite the grind of writing and editing the Beagle reports, Darwin made remarkable progress on transmutation, taking every opportunity to question expert naturalists and, unconventionally, people with practical experience such as farmers and pigeon fanciers.
Malia a rutina na escritura e edición dos informes do Beagle, Darwin fixo importantes avances na transmutación ao aproveitar cada oportunidade de lle preguntar non só a naturalistas senón tamén a xente con experiencia práctica como agricultores e granxeiros de porcos.