These centuries include the second period of their academic history. Their authority is now hardly questioned; and woe to the questioner! They furnish the basis for the great structure of scholastic philosophy; they are reconciled with Christian doctrine. Aristotle is thenceforward "The Philosopher"—he is so styled even in modern scholastic philosophy; he is "the forerunner of Christ in things natural," "the master of those who know." In this period, then, academic debate concerned itself with matters of detail. What portions of his works should be studied for the various degrees in Arts? In what order should they be studied? What comments should be read? What translations should be used? So late as 1519 these are the chief questions considered in the reformed plan of studies in Arts at Leipzig. The reader will note the stress laid upon the study of the text itself; the exclusion of frivolous comments, and the use of the latest translations by Greek scholars.

Inasmuch as no good thing is more desirable than philosophy, as Cicero says, and none more advantageous has been given to the race of mortals, or granted by heaven, or will ever be given as a gift; in order that we may possess this too, we choose as our guide Aristotle, whom we cause to be commended for his knowledge of facts, the number of his works, his ability in speaking, and the acumen of his intellectual powers. Nor will we interpret the visions and involved questions of his interpreters, since it is characteristic of a very poor intellect to grow wise from commentaries only, in which, neglecting Aristotle's meaning, the Sophists dispute about empty trifles. But his works, translated in part by Archeropylus [Argyropulos], in part by Augustus Nipho and Hermolaus Barbarus and Theodoras Gaza, will be made clear in the order outlined below:[24] [Then follows the list of books, for which see p. 134].

The third stage of the debate concerning Aristotle began shortly after 1500. His works were less exclusively the subject of study: they were being displaced by the Latin and Greek classics. They were, moreover, the object of repeated attack. In 1536, in the University of Paris, which had so long maintained their study, Pierre Ramus successfully defended the startling thesis, "Everything that Aristotle taught is false." This was only one sign of their loss of prestige. New and improved text-books in Logic absorbed the useful portions of the Organon; the authority of the Natural Philosophy waned with the rise of experimental science; that of the Metaphysics yielded to the new philosophy of Descartes. By the end of the seventeenth century they ceased to be a potent factor in university studies.

(b) The Roman Law

The great compilation of the Roman Law known as the Corpus Juris Civilis (Body of Civil Law) constitutes a second important addition of the twelfth century to the field of university studies. It was probably more important as an influence upon the growth of universities than the works of Aristotle.

The greater part of the Corpus Juris was compiled at Constantinople, 529-533 A.D., by certain eminent jurists under the Roman Emperor, Justinian. The purpose of the work was to reduce to order and harmony the mass of confused and contradictory statutes and legal opinions, and to furnish a standard body of laws of manageable size in place of the unwieldly mass of incorrect texts commonly in use, so that "the entire ancient law, in a state of confusion for some fourteen hundred years and now by us made clear, may be, so to speak, enclosed within a wall and have nothing left outside it." The jurists entrusted with this work were also required to prepare an introductory book for students, as described below. After the completion of the whole work Justinian issued (533-565) many new statutes (Novellae) which were never officially collected, but which came to be considered a part of the Corpus Juris. The main divisions of the Body of Civil Law are—

(1) The Code, in twelve books, which contains statutes of the Emperors from the third century A.D.

Since [says Justinian] we find the whole course of our statutes … to be in a state of such confusion that they reach to an infinite length and surpass the bounds of all human capacity, it was therefore our first desire to make a beginning with the most sacred Emperors of old times, to amend their statutes, and to put them in a clear order, so that they might be collected together in one book, and, being divested of all superfluous repetition and most inequitable disagreement, might afford to all mankind the ready resource of their unalloyed character.[25]

(2) The Digest, or Pandects, in fifty books, containing extracts from the opinions of Roman lawyers on a great variety of legal questions. This work was also undertaken to bring order and harmony out of the prevailing confusion:

We have entrusted the entire task to Tribonianus, a most distinguished man, Master of the Offices, ex-quaestor of our sacred palace, and ex-consul, and we have laid on him the whole service of the enterprise described, so that with other illustrious and learned colleagues he might fulfil our desire. [He is] to collect together and to submit to certain modifications the very most important works of old times, thoroughly intermixed and broken up as they may almost be called. But in the midst of our careful researches, it was intimated to us by the said exalted person that there were nearly two thousand books written by the old lawyers, and more than three million lines were left us by them, all of which it was requisite to read and carefully consider and out of them to select whatever might be best. [This was accomplished] so that everything of great importance was collected into fifty books, and all ambiguities were settled, without any refractory passage being left.[26]