Roger Bacon was born about 1214, and going early to Oxford fell under the influence of the most liberal teachers in Europe, at whose head stood Robert Grosseteste, afterward Bishop of Lincoln. Bacon conceived a veneration for Grosseteste, and even for Adam de Marisco his disciple, and turning toward mathematics rather than toward metaphysics he eagerly applied himself, when he went to Paris, to astrology and alchemy, which were the progenitors of the modern exact sciences. In the thirteenth century a young man like Bacon could hardly stand alone, and Bacon joined the Franciscans, but before many years elapsed he embroiled himself with his superiors. His friend, Grosseteste, died in 1253, the year after Innocent IV issued the bull _Ad extirpanda_ establishing the Inquisition, and Bacon felt the consequences. The general of his order, Saint Bonaventura, withdrew him from Oxford where he was prominent, and immured him in a Parisian convent, treating him rigorously, as Bacon intimated to Pope Clement IV. There he remained, silenced, for some ten years, until the election of Clement IV, in 1265. Bacon at once wrote to Clement complaining of his imprisonment, and deploring to the pope the plight into which scientific education had fallen. The pope replied directing Bacon to explain his views in a treatise, but did not order his release. In response Bacon composed the _Opus Majus_. The _Opus Majus_ deals among other things with experimental science, and in the introductory chapter to the sixth part Bacon stated the theory of inductive thought quite as lucidly as did Francis Bacon three and a half centuries later in the _Novum Organum_. [Footnote: Positis radicibus sapientiae Latinorum penes Linguas et Mathematicam et Perspectivam, nunc volo revolvere radices a parte Scientiae Experimentalis, quia sine experientia nihil sufficienter scire protest. Duo enim simt modi cognoscendi, scilicet per argumentum et experimentum. Argumentum concludit et facit nos concedere conclusionem, sed non certificat neque removet dubitationem ut quiescat animus in intuitu veritatis, nisi eam inveniat via experientiae; quia multi habent argumenta ad scibilia, sed quia non habent experientiam, negligunt ea, nee vitant nociva nex persequuntue bona. J. H. Bridges, _The Opus Majus of Roger Bacon_ (Oxford, 1897), II, 167.]