This is all the more surprising because, as we have shown, just about this time the Popes began the work of making their Medical School at Rome the most important center for medical education, especially in the scientific phases of medicine--anatomy, physiology, and comparative anatomy--that there was at that time in the world. In spite of this rivalry, however, nothing was done directly to hurt the prestige of the school of Bologna, and indeed the rivalry seems to have been more of an encouraging competition than in any sense a destructive struggle for existence. When the Popes took possession of Bologna, Alexander Achillini was professor of anatomy and medicine in the Bolognese school, and his discoveries and methods of investigation attracted the attention of students from all over the world. His assistant for many years and his successor in the {245} post was Berengar of Carpi, of whom we have already said much in the chapter Anatomy Down to the Renaissance. For some time Vesalius lectured on medicine and anatomy at Bologna, and one of Berengar's most distinguished successors in the sixteenth century was Aranzi, who occupied the post of anatomical professor for thirty-two years and who corrected a number of errors in anatomical detail that had been made by Vesalius and others of the preceding generation. He confirmed Columbus's discoveries at Rome with regard to the course which the blood follows in passing from the right to the left side of the heart, and made many important additions to the knowledge of the anatomical relations of the cavities of the heart, the valves, and the great blood vessels. There are a number of important structures in the brain which owe their names to him, and his descriptions of them are better, according to Prof. Turner, than those of other anatomists for a century after his time.