In 1775, he took part in an expedition to Canada and wrote a thorough diary, where he collected information about the indigenous people, their social organisation, customs, religion and even the flora of that region. His diary was used as a guide for further explorations such as the expedition to Tasmania, carried out by James Cook. Four years later, he took part in another expedition to the north-west coast in North America. He reached the Islands of Wales Prince in South Alaska and went on to St Elías Cape, near Anchorage, the present capital of Alaska state.