ARISTOTLE 



718 a 



VTTapxovcnv avrols. ovre yap tol !^q)OTOKovvTa 

 ojxoicog ep^ei iravra, aAA' dvOpcorroi fJU€V /cat ra Tre^a 

 718 b TTavra Kara) rrpos rol? dpdpoL?, rd Se aeXdxT] (jdy^ 



t,(x>OTOKOvvra dvco Trpos roi V7Toi,d)fjiaTL, ovre rd 

 (poroKovvra, dAA' ol fxev Ixdves Karoj Kaddnep 

 dvdpojTTog Kal rd t,cporoKovvra rdv rerpaTTohoji', 

 OL 8' opvides dvo), Kal oaa (voroKel tcov rerpa- 

 5 TToSojv. ov jxrjv aAA' exovcn /cat aurat at TJTrevav- 

 Tidiceeis Kard Xoyov. irpdiTov /xev ydp rd ipo- 

 TOKovvra (poroKel hiatj^epovTcos' rd pikv ydp dreXi] 

 TTpoLerai ra (La, olov ol l)(6v€S' e^co ydp cttl- 

 reXelraL Kal Xap,^dv€L av^rjOLV rd rdjv Ixdvatv. 

 alrtov 8 orL rroXvyova ravra, Kal rovr' epyov 

 10 avrcijv .ojaTTep rdJv (f)vra)v el ovv ev avrols ireXeaL- 

 ovpyovv, dvayKaXov oXCya rep TrXrjdeL etvai* vvv Se 

 roaavra loxovglv ware Sok€lv <(ev)^ oiov etvai rrjv 

 varepav eKarepav ev ye rols pLLKpols Ix^vSioif^- 

 ravra ydp TToXvyovcurard eanv, wortep Kal errl 

 rcbv dXXoiv ra)V dvdXoyov rovroLg exovrcDV rr^v 

 cfivcTLV, Kal ev (f)vroLS Kal ev t,cpoLS' rj ydp rov 



^ <Ta> Peck, vel fortasse ^MoroKa <oin-a>. 



* <ev> Peck, unum ovum S. ev supplendum esse suspicati 

 erant A.-W. (collato H.A. 510 b 24), Schneider. 



" Selachia : the cartilaginous fishes, including the Sharks. 

 The " fishing-frog " is not viviparous (see 754 a 26, n.). 



* The observation of Aristotle that the eggs of many 

 organisms swell during their development, though unap- 

 preciated for many centuries, is the basis of the modern 

 distinction between cleidoic and non-cleidoic eggs. The 

 walls of a cleidoic egg are permeable only to matter in the 

 gaseous state {e.g., the hen's egg). Most aquatic animals, 

 however, lay non-cleidoic eggs, i.e., eggs which, though they 

 have a sufficiency of organic material (such as proteins, fats, 

 28 



