This book consists of letters written to Roderic Mackenzie during Alexander Mackenzie's travels to such places as Ile a la Crosse, Grand Portage, Sandy Bay, Athabasca, Lac la Loche, Lac la Pluie, Fort Chipeywan, and other locations. He frequently mentions encounters with Indians, specifically "Red Knives", Chipewyan, Cree, and Beaver Indians.