The pioneering geology of Sir William Edmond Logan laid the groundwork for the Geological Survey of Canada, the Canadian Museum of Nature, the Canadian Museum of Civilization, and the Canada Museum of Science and Technology. This volume presents Logan's 1845 field journal, written on a geological expedition up the Ottawa River from Bytown to Lake Timiskaming. The journal is sprinkled with fascinating stories of daily life during the expedition, supplemented with Logan's sketches of the landscape and geological features. An introductory essay provides insight into Logan's records, the survey instruments he used, and the significance of his 1845 fieldwork.