39.] This idea, which in the Roman Empire and in the Middle Ages took the form of a universal State and a universal Church, passed afterwards into the conception of the intercohesion of peoples as contributors to a common pool of civilisation--a principle which, when the idea of Progress at last made its appearance in the world, was to be one of the elements in its growth.
3.
One remarkable man, the Franciscan friar Roger Bacon, [Footnote: c.

A.D.
1210-92.

Of Bacon's Opus Majus the best and only complete edition is that of J.H.Bridges, 2 vols.

1897 (with an excellent Introduction).
The associated works, Opus Minus and Opus Tertium, have been edited by Brewer, Fr.

Rogeri Bacon Opera Inedita, 1859.]who stands on an isolated pinnacle of his own in the Middle Ages, deserves particular consideration.