The author records a winter residence at Fort Clarke and subsequent journeys through the Upper Missouri and eastern waterways, combining day-to-day camp life, weather and hunting hardships with close descriptions of Mandan, Sioux and Manitari ceremonies, dances, social visits, and village architecture. Narratives recount peace negotiations, epidemics reaching trading posts, and travel from Fort Clarke to Leavenworth, down the Ohio into Lake Erie and Niagara, then eastward. An appendix assembles tribal vocabularies and sign language, meteorological and natural-history lists, treaties and Indian traditions, and practical observations from forts and winter villages.