This fascinating report details the results of the Jesup North Pacific Expedition's efforts to catalog the mammals of northeastern Siberia and to study their environments and behavior. The report includes itinerary and field notes that offer a rare glimpse into the logistics and challenges of such an ambitious scientific undertaking. A must-read for anyone interested in natural history, zoology, or environmental science.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.