This report presents the findings of the Smithsonian Institution's explorations and fieldwork in various regions of the world during the years 1924-26. With contributions from a wide range of experts in fields such as anthropology, botany, and zoology, this report provides readers with a fascinating glimpse into the scientific exploration of the early 20th century. Illustrated with photographs and diagrams, this report is an essential resource for historians of science and anyone interested in the exploration of the natural world. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.