His series of newspaper articles in 1810,<ref>Not 1803 as some books say.</ref> appeared in book form, as ''Arator, Being a Series of Agricultural Essays, Practical and Political'' in 1813. In 1814 he published his major book, ''An Inquiry into the Principles and Policy of the Government of the United States.'' | His series of newspaper articles in 1810,<ref>Not 1803 as some books say.</ref> appeared in book form, as ''Arator, Being a Series of Agricultural Essays, Practical and Political'' in 1813. In 1814 he published his major book, ''An Inquiry into the Principles and Policy of the Government of the United States.'' |