Another convincing case where understanding of the body was extended beyond where Galen had left it came from these demonstrations of the nature of human circulation and the subsequent work of Andrea Cesalpino, Fabricio of Acquapendente and William Harvey.
Ta vsebuje komentarje o dihanju in pretoku krvi, ki popravljajo dela prejšnjih uveljavljenih avtorjev, kot so Vesalius, Caius in Janus Cornarius.