Page:Early Greek philosophy by John Burnet, 3rd edition, 1920.djvu/362

348 for, as we have seen, all later writers quote Demokritos only. A further proof of the correctness of the statement is that we also find it attributed to Diogenes of Apollonia, who, as Theophrastos tells us, derived some of his views from Leukippos. There is nothing surprising in this. Parmenides had already declared the senses to be deceitful, and said that colour and the like were only "names," and Empedokles had also spoken of coming into being and passing away as only a name. It is not likely that Leukippos went much further than this. It would probably be wrong to credit him with Demokritos's clear distinction between "true-born" and "bastard" knowledge, or that between the primary and secondary qualities of matter. These distinctions imply a definite theory of knowledge, and all we are entitled to say is that the germs of it were already to be found in the writings of Leukippos and his predecessors. Of course, these do not make Leukippos a sceptic any more than Empedokles or Anaxagoras, whose remark on this subject (fr. 21a) Demokritos is said to have quoted with approval.

There appear to be sufficient grounds for ascribing the theory of perception by means of simulacra or εἴδωλα which played such a part in the systems of Demokritos and Epicurus, to Leukippos. It is a natural development of the Empedoklean theory of "effluences" (§ 118). It hardly seems likely, however, that he went into detail on the subject, and it is safer to credit Demokritos with the elaboration of the theory.