He systematized the Inquisition and entrusted it to the Dominicans; his rules against heretics remained in force until the time of Sixtus V.
In its systematized form, as a branch of botanical study, it is of recent date, and, as now understood, the subject first received special attention about 1850, when the nature of parasitism began to be intelligible; but many disjointed references to diseased conditions of plants had appeared long before this.
He systematized the form of the land within the ring of ocean - the habitable world - by recognizing two continents: Europe to the north, and Asia to the south of the midland sea.
It is, however, during the Middle Minoan age, the centre point of which corresponds with the XIIth Egyptian dynasty, according to the Sothic system of dating, c. 2000-1850 B.C., that a systematized pictographic or hieroglyphic script makes its appearance which is common both to signets and clay tablets.
His immense learning served him rather as a storehouse of illustrations, or as an armoury out of which he could choose the fittest weapon for discomfiting on opponent, than as a quarry furnishing him with material for building up a completely designed and enduring edifice of systematized truth.