Born at Huntly Hill, near
Brechin,
Angus, Nichol was the son of John Nichol from
Northumberland, a gentleman farmer, and his wife Jane Forbes from
Ellon, Aberdeenshire. He was educated at the local
grammar school and then studied mathematics and natural philosophy (physics) at
King's College,
University of Aberdeen. He then changed to study divinity. He was licensed as a
preacher and became a highly effective communicator, but the impact of
phrenological thinking led him to abandon the Church for education. Nichol held a number of posts in education and journalism and corresponded with many leading thinkers of the times, including
John Stuart Mill. He clearly made some impression in economics as
James Mill and
Nassau Senior nominated him as
Jean-Baptiste Say's successor as professor of
political economy at the
Collège de France though he was at the time too ill to take the post. ==Astronomy==