overall title and the commentary of Narboni, but in which the treatise is given a close association rath De Substantia Orbis VII, which immedi ately follows it in the text. This third version is the sole case in which a Hebrew translator can be named: the translation was made by Todros Todrosi in the year 1340. The only conclusion to be drawn from his translation is that Todrosi may definitively be eliminated as the translator of any of the other ver sions. However, we may be able to draw a tentative conclusion as to the formation of the Hebrew collection. The earliest evidence for the...