e.g. nose, eye, face, flesh, bone, and, in general, animal; leaf, root, bark, and, in general, plant (for none of these can be defined without reference to movement-they always have matter), it is clear how we must seek and define the 'what' in the case of natural objects, and also that it belongs to the student of nature to study even soul in a certain sense, i.e. so much of it as is not independent of matter.
Beraz, errealitate fisiko guztiak sudur motzaren moduan 1026a) esaten badira, adibidez sudurra, begia, aurpegia, haragia, hezurra, edo hitz batez esanda, animalia; hostoa, sustraia, azala eta, orokorrean, landarea (hauen definizio bat bera ere ezin mugimendurik gabe izan, beti 5) izaten baitu materia), argi dago fisikan zerkia nola ikertu eta definitu behar den, eta horregatik dagokio fisikariari ere nolabaiteko arima-materiarik gabe ematen ez den hori, hain zuzen ere-ikertzea. Horrela, bada, agerian uzten du honek guztiak fisika zientzia teoretikoa dela.