Illustrations are from photographs taken by Vittorio Sella, member of the expedition "To this volume, which contains a narrative of the journey and of the actual exploration work of the expedition, together with the meteorological and astronomical notes, will be added a second volume [pub. in Italian only] containing the geological and mineralogical report of Dr. A. Roccati, together with reports upon the zoological and botanical specimens brought back by us."--Pref Translation from Italian made by Caroline de Filippi "The appendices have been translated by Prof. A. H. Keane." Appendices: A. Dr. Luigi Hugues. The Mountains of the Moon of Ptolemy's geography and the Ruwenzori range.--B. Astronomic, geodetic and meteorological observations: I. Report on astronomic observations, by P. Campigli. II. Geodetic observations, by P. Campigli. III. Report on meteorological and altimetric observations, by Prof. D. Omodei.--C. Summary of the geological, petrographic, and mineralogical observations which were made by H. R. H. the Duke of Abruzzi's Ruwenzori expedition, together with a list of the new zoological and botanical genera and species collected in the Ruwenzori regions