or Ecclesiastical law--consisting of papal decretals on various points which were founded partially on the Roman or Civil law--a juridical system which also fully and indeed almost exclusively recognized the individual holding of property as the basis of civil society (albeit not without a recognition of social duties on the part of the owner). Learning was now beginning to differentiate itself from the ecclesiastical profession, and to become a definite vocation in its various branches. Crowds of students flocked to the seats of learning, and, as travelling scholars, earned a precarious living by begging or "professing" medicine, assisting the illiterate for a small fee, or working wonders, such as casting horoscopes, or performing thaumaturgic tricks. The professors of law were now the most influential members of the Imperial Council and of the various Imperial Courts. In Central Europe, as elsewhere, notably in France, the civil lawyers were always on the side of the centralizing power, alike against the local jurisdictions and against the peasantry. The effects of the conquest of Constantinople in 1453, and the consequent dispersion of the accumulated Greek learning of the Byzantine Empire, had, by the end of the fifteenth century, begun to show themselves in a notable modification of European culture. The circle of the seven sciences, the Quadrivium, and the Trivium, in other words, the mediaeval system of learning, began to be antiquated. Scholastic philosophy, that is to say, the controversy of the Scotists and the Thomists, was now growing out of date. Plato was extolled at the expense of Aristotle. Greek, and even Hebrew, was eagerly sought after. Latin itself was assuming another aspect; the Renaissance Latin is classical Latin, whilst Mediaeval Latin is dog-Latin. The physical universe now began to be inquired into with a perfectly fresh interest, but the inquiries were still conducted under the aegis of the old habits of thought. The universe was still a system of mysterious affinities and magical powers to the investigator of the Renaissance period, as it had been before. There was this difference, however; it was now attempted to _systematize_ the magical theory of the universe. While the common man held a store of traditional magical beliefs respecting the natural world, the learned man deduced these beliefs from the Neo-Platonists, from the Kabbala, from Hermes Trismegistos, and from a variety of other sources, and attempted to arrange this somewhat heterogeneous mass of erudite lore into a system of organized thought.