735 b 



ARISTOTLE 



vofievov TTV€vyiaTOS. koI -q fioXv^Saiva ixiyvvfievrj 

 vBan Kal^ iXaiqj i^ oXiyov re ttoXvv oyKov Trotet 

 /cat e^ vypov axK^pov /cat e/c fxeXavog XevKov. 

 aiTLOv 8' oTt iyKarafibyvvraL TTvevfJia, o rov re 



20 oyicov TTOLei /cat ttjv XevKOTrjTa Sta^atVet, oicnrep 

 €v rep a(f)pcp /cat rfj ;^tovf /cat yap i^ ;^tcov iariv 

 acjipos. /cat ayro to vhcup^ iXaicp fxiyvvp^evov 

 ytverat 7Ta)(v Kal XevKov /cat yap utto t-^s TpLipews 

 ey/cara/cAeterat 7TV€vp,a, /cat auro to eXaiov e;(et 



25 TTvevpia ttoXv eari yap ovre yr^s ovre vSaros aAAa 

 TTvevfiaros ro Xnrapov. Sto /cat eTrt to) vhari 

 eTTLTToXd^ef 6 yap iv avro) ojv drjp, djoTrep €V dy- 

 yeto), cf)€p€L dva> /cat eTTiTToXdl^ei /cat atVio? tt^s" 

 KOV(f>6r'r]T6s ear IV. /cat ev- TOt? i/jvxecrt 8e /cat 

 TrdyoL? TraxvveraL ro eXatov, ir-qyi-vrai 8' ov' 8ta 



30 jLtev yap Oeppiorrjra ov TT-qyvvrai (o yap ai^p depp,6v 



/cat aTTrjKrov), 8ta Se to avviaraadat avrov /cat 



TTVKvovadai [c5o-7rep]^ wtto to£? i/jv^ovs rra)(vrepov 



yiveraL ro eXaiov. Sid ravras rds air lag /cat to 



(TTrep/xa eacodev fxev i^epxerai arL(j)pdv /cat Aey/coi', 



U7TO TTj? evrog deppborrjros TTvevfia ttoXv e)(ov Oep- 



"^ Kal PS : ^ Kal vulg. ^ vScop P : v8a>p ru) vulg. 



' seel. A.-W. ; fortasse avrov TrvKvovrai [tucrTrep . . . eXaiov] 

 scribendum (haec om. 2). lac. post uxmep stat. Sus. 



" This is no doubt galena (lead sulphide), the chief ore 

 found in the Attic mines at Laurium, although these were 

 more famous for their silver output. The reference to the 

 mixing of the ore with Mater and oil, which heretofore seems 

 to have passed unnoticed, must imply an early process of 

 " flotation," a stage which follows the mechanical crushing 

 of the ore and precedes the metallurgical extracting of the 

 metal, its object being to separate the metalliferous from 

 the non-metalliferous constituents of the ore by means of tht- 

 production of a froth. The first practically successful 



160 



