 Diogenes Laertius (IX 55 = 80A1 DK) attributes many works to Protagoras, but a comparison with other sources reveals that his list is incomplete. Still worse, what is missing from Diogenes’ list are precisely the most important and controversial works, such as Truth and On the Gods. One possible explanation is that these two texts constituted individual sections of the Antilogiae (Opposing Arguments, mentioned by Diogenes), which were possibly known also as Kataballontes logoi (The Overthrower Arguments or, better, The Knockdown Arguments; in M VII 60 Sextus Empiricus attributes to this text the “Man measure” sentence, which other sources refer to Truth; see Decleva Caizzi 1999: 317; Lee 2005: 24–29). Intriguing as it is, the hypothesis is difficult to prove. The title suggests that the Antilogiai were structured upon some sort of oppositions (an interesting parallel are the Dissoi logoi); but there is no indication of oppositions in the surviving fragments from Truth and On the Gods. Again, any attempt at reconstruction is destined to remain speculative, given the dearth of available fragments. Other titles such as The Art of Eristic, On Wrestling, On Sciences, On Love of Honours, On the Constitution show the breadth of Protagoras’ interests.