Alexander von Humboldt's first stop at the beginning of his five-year research journey to South America was the Canary Island of Tenerife. This stay in 1799 lasted a week. He ascended the Teide volcano and measured its height with extraordinary accuracy, studied the island from geological, botanical, and astronomical perspectives, visited the famous dragon tree in Orotava, and developed his science of plant geography. The life and work of the renowned German researcher and scholar. Original texts and drawings from Humboldt's historical travel report. Numerous illustrations and explanations about the nature and history of Tenerife. Foreword by Ottmar Ette.