Abstract
A Fragment of ancient philosophy is like a code message which it is the task of the scholar to decipher. The cryptogram has come down to us, but not the key. In case this beginning should be thought obvious by anyone, let me say at once that I do not believe a word of it, though I believe that the attitude it epitomizes is by no means uncommon and is part of the explanation of a tendency to mishandle philosophical fragments. The attitude is to be found, for example, in some things M. Untersteiner has said in his recently translated book on the Sophists1 about the meaning of the well-known statement of Protagoras