The Collationes in Hexaemeron (Latin: [kɔllatsiɔnɛs in ɛksɛmɛɾɔn], Talks on the Six Days [of Creation]) are an unfinished series of theological lectures given by St. Bonaventure in Paris between Easter and Pentecost 1273. They exist only in listeners' transcripts (reportationes) handed down both in a shorter version (Reportatio A) and a longer, significantly different (Reportatio B). Source: Wikipedia (en)