The volume gathers vividly descriptive essays that portray tropical and mountain landscapes—oceans, forests, steppes, and high Andes—paired with scientific elucidations that explain geological, botanical, and climatic phenomena. The author combines literary observation with measurements and comparative data, discusses volcano structure and a speculative essay on vital force, and reports insights gained from expeditions across diverse regions. Throughout, attention is given to how external nature affects human feelings and moral dispositions, and to the value of precise observation and numerical comparison in understanding the concurrent action of natural forces.