The first sentence in "Blake" in The Sacred Wood by T. S. Eliot is
If one follow Blake’s mind through the several stages of his poetic development it is impossible to regard him as a naïf, a wild man, a wild pet for the supercultivated.
Why did he use "follow", but not "follows"? Because this book has been reprinted for several times, the usage of "follow" here is not likely to be a typo.
EDIT: In Selected Essays, 1917-1932, Eliot changed "follow" to "follows".