ABSTRACT
ABRIEFERversionof[z],4practicallyidenticalwithitspart [b],isascribedtoZenobyDiogenesLaertius(VitaePhi/os.9,72) inapassageinwhichheappearstobefollowingagoodsource: allcitationsin71-3arereliable,andmostofthemareletterperfect.Ofthetwoversionsthisistheonelikelytobethecloser totheoriginal:thelongeroneinEpiphaniuslookslikeanexpansionofthisonetomakeit'compl[y]withtherulesandconventionsofpost-Aristoteliansyllogisms'(Frankel7).Inanycase, theascriptionof[zb]toZenohasthebackingofbothDiogenes andEpiphanius,andIknowofnogoodreasontodoubtit.Itis truethatSextus,reportingonthreeseparateoccasions(Pyrrh.
