In 1743 he visited the shores of Lake Ontario in the north, and wrote "Observations on the Inhabitants, Climate, Soil, Rivers, Productions, Animals, and other Matters Worthy of Notice, made by Mr. John Bartram in his Travels from Pennsylvania to Onondaga, Oswego, and the Lake Ontario, in Canada" (London, 1751).
Описание одного из своих путешествий он издал под заглавием "«Observations on the inhabitants, climate, soil, productions, animals… made in his travels from Pennsylvania to Onondago, Oswego and the lake Ontario»" (Лондон, 1751).