Scientific works.  Grosseteste’s scientific writings include what appear to be his earliest works, which possibly were written during the first two decades of the thirteenth century: On the Liberal Arts (De artibus liberalibus), On the Generation of Sounds (De generatione sonorum), and On the Sphere (De sphaera), an outline of astronomy.  Later in the thirteenth century, Grosseteste wrote a number of short scientific works including On Comets (De cometis), On Lines, Angles and Figures (De lineis, angulis et figuris), On the Nature of Places (De natura locorum), On the Rainbow (De iride), On Color, (De colore), On Local Differences (De diferentiis localibus), and On the Movement of the Supercelestial Bodies (De motu supercaelestium). (For an outline of the content of many of these works see Dales 1961 and Panti 2001. The works On the Heat of the Sun (De calore solis), On the Tides (De fluxu et refluxu maris), On the Generation of the Stars (De generatione stellarum), and On the Impressions of the Air (De impressionibus aeris), first edited in Baur 1912, are probably inauthentic. In the most recent discussion of the dating of Grosseteste’s scientific works, Panti 2013 argues that the first two of these works were probably written by Adam of Exeter, the addressee of Grosseteste’s first letter.).