The Franciscan Roger Bacon (c.1214-92?) was one of the most significant intellectuals of the thirteenth century. His most important work was the Opus Majus of 1267 (also available in this series). The works included in this volume, edited by J. S. Brewer, had not previously been published, and only one volume of the unpublished works ever appeared, because of Brewer's other commitments. The Opus Minus was a pr cis of the larger work, written at the...