RT Journal Article SR Electronic A1 Stránský, Jiří T1 Who is φυσικος According to Aristotle? (De an. 403A29-B18) JF Aither YR 2015 VO 7 IS 1 SP 56 OP 69 DO 10.5507/aither.2015.006 UL https://aither.upol.cz/en/artkey/ath-201501-0006.php AB The aim of this paper is to answer the following question: "Who, according to Aristotle, is the natural philosopher?" On the basis of a short passage from De anima (403a29-b18) it is argued that the term "natural philosopher" is used by Aristotle in two different senses: first, it applies to a ionian type of thinker who reduces his research to the material cause only, second, it applies to a thinker who does his research properly, that is, who takes into account all four aristotelian causes.