In 1809, Henry had written to Askin, "There is only us four old friends (James McGill, Isaac Todd, Joseph Frobisher, and himself) alive, all the new North westards are a parcel of boys and upstarts, who were not born in our time, and supposes they know much more of the Indian trade than any before them." To recapture his exciting past, he wrote a memoir of his life which he published in New York that year and dedicated to his English friend, Sir Joseph Banks. "Travels and Adventures in Canada and the Indian Territories, between the years 1760 and 1776" has become a Canadian adventure classic and is still considered as one of the best descriptions of Native Indian life at the time of Henry's travels.