This work is a detailed narrative of a scientific expedition through Somali-land (the Horn of Africa), starting from Berbera and reaching the "Leopard River" (Webbe Shebeyli). The author explains that the mission was undertaken to conduct a scientific exploration of the interior, open the region to future commerce, and provide a new field for collectors and sportsmen. The journey was highly significant as it penetrated far beyond any point previously reached by European explorers into territory that had remained a "sealed book".

The narrative describes the logistics of 19th-century exploration, including the challenges of hiring camel transport, managing an escort of Aden Somalis, and navigating tribal politics [Pages 40, 55]. The expedition faced significant obstacles, including mutinies among the camel drivers, extreme water scarcity while crossing the "Haud" desert, and the hostile disposition of various tribes. The book highlights a specific conflict with British government officials who attempted to stop the expedition mid-journey due to its perceived danger.

Beyond travelogue, the book serves as a scientific record. It includes extensive appendices documenting newly discovered fauna and flora, including lepidoptera, mammals, birds, and plants. The work concludes with the successful return of the party to Berbera after roughly four months in the interior.