[The Darmstadt Johannes Alexandrinus fragment]

Three latin fragments (about 1050), included in the envelope of a manuscript, written about 1530 in Cologne, could be identified as parts of the latin version of an Alexandrian commentary (probably written by Johannes Alexandrinus) on Galen's book 'De sectis'. C. D. Pritchet edited this text in 1982, but he thought that he was printing a translation of this commentary on Galen's book, written by Burgundio de Pisa in the year 1185. By means of an exact comparative analysis of the fragments with Galen's original Greek text, we were able to show that these fragments offer almost the same text as Pritchet. But it is remarkable that there are some differences between our version and the text of Pritchet. It seems that our version proves the existence of an until now unknown medieval revision of the Galen-commentary by Johannes Alexandrinus.