Gundissalinus De divisione philosophiae.
The chief known work of Gundissalinus, the archdeacon who was for a time perhaps associated with John of Spain in the labor of translation, is his De divisione philosophiae, [203] a treatise which owes much to the Turkoman Al-Farabi (Muh. b. Muh. b. Tarchân b. Uzlag, Abû Nasr, el-Fârâbî). If Baur is right in thinking that Gundissalinus made use of translations by Gerard of Cremona, 1114-1187, in the De divisione philosophiae,[204] it would appear to be a later work than his translating for Archbishop Raymond, 1130-1150, which perhaps began as early as 1133.[205]
Place of magic in the classification of the sciences.
In the classification and description of the sciences which make up the bulk of the De divisione philosophiae Gundissalinus gives a certain place to the occult arts. At the beginning of the book, it is true, the magic arts are not classed among useful things of the spirit like the virtues and true sciences (honestae scientiae). Neither, however, are they grouped with pride, avarice, and vain glory as harmful vices, but are merely classed along with worldly honors as vanities. [206] “Nigromancy according to physics,” however, is later listed as one of eight sub-divisions of natural science together with alchemy, medicine, agriculture, navigation, the science of mirrors, and the sciences of images and of judgments.[207] Gundissalinus was innocent, however, of any detailed knowledge of necromancy or indeed of any of the other sub-divisions except medicine. He explains that he has not yet advanced as far as these subjects in his studies.[208] He is manifestly simply copying an Arabic classification, probably from Al-Farabi’s De ortu scientiarum, and one of which we find similar traces in other medieval Christian authors.[209]
Al-Farabi De ortu scientiarum.
This little treatise on The Rise of the Sciences by Al-Farabi, although it occupies only a leaf or two in the manuscripts and has only recently been printed,[210] is a rather important one to note, as other of its statements than its eight sub-divisions of natural science seem to be paralleled in medieval Latin writers. There seems, for instance, a resemblance between its attitude towards the sciences and classification of them and that of Roger Bacon in the Opus Maius.[211] Al-Farabi believes in God the Creator, as his opening words show, and he regards “divine science” as the end and perfection of the other sciences; “and beyond it investigation does not go, for it is itself the goal to which all inquiry tends.”[212] At the same time Al-Farabi emphasizes the importance of natural science, adding its eight parts to the four divisions of the quadrivium—arithmetic, geometry, astrology, and music, and saying, “Moreover, this last (i. e. natural) science is greater and broader than any of those sciences and disciplines (or, than any of those disciplinary sciences).” We need a science, he says in effect, which deals inclusively with changes in nature, showing how they are brought about and their causes and enabling us to repel their harmful action when we wish or to augment them,—a science of action and passion.[213] This suggestion of applied science and of a connection between it and magic also reminds one of Roger Bacon, as does Al-Farabi’s statement later that the beginning of all sciences is the science of language.
Gundissalinus on astrology.
Both for Al-Farabi and Gundissalinus the sciences of images and judgments were undoubtedly astrological. Gundissalinus himself believes that the spiritual virtue of the celestial bodies is the efficient cause, ordained by the Creator, of generation, corruption, and other natural operations in this corporeal world. He defines astrologia as we would astronomy, while he explains that astronomia is the science of answering questions from the position of the planets and signs. There are many such sciences,—geomancy, hydromancy, aeromancy, pyromancy, chiromancy, and augury; but astronomy is superior to the rest because it predicts what will befall upon earth from the dispositions of the heavenly bodies. Gundissalinus also repeats Isidore’s distinction between astronomia and astrologia, and between the natural and superstitious varieties of “astronomy.”[214]
Robert Kilwardby, De ortu sive divisione scientiarum.
At this point it may be well to note briefly a later work with a very similar title to that of Gundissalinus, namely, the De ortu sive divisione scientiarum of Robert Kilwardby, [215] archbishop of Canterbury from 1272 to 1279. The work borrows a great deal from Isidore, Hugh of St. Victor, and Gundissalinus. One of its more original passages is that in which Kilwardby suggests an alteration in Hugh’s division of the mechanical arts, omitting theatrical performances as more suited to Gentiles than Catholics, and arranging the mechanical arts in a trivium consisting of earth-culture, food-science, and medicine, and a quadrivium made up of costuming, armor-making, architecture, and business-courses (mercatura), after the analogy of the seven liberal arts.[216] Kilwardby, as has been already noted elsewhere, repeats Hugh’s classification of the magic arts.[217]