ERRORS ATTRIBUTED TO ARISTOTLE. 197 



he denotes the same things ; and, if this be so, 

 then the rp^ara must be the smaller bronchial canals, in 

 which the cartilages disappear. 



This view of the structure of the lung is perfectly 

 correct so far as it extends ; and, bearing it in mind, 

 we shall be in a position to understand what Aristotle 

 thought about the passage of air from the lungs into the 

 heart. In every part of the lung, he says, in effect, 

 there is an air tube which is derived from the trachea, 

 and other tubes which are derived from the Tropot, which 

 connect the lung with the heart (sujprd, C}. Their ap- 

 plied walls constitute the thin " synapses " (rrjv a-vva^iv) 

 through which the air passes out of the air tubes into the 

 TTopoi, or blood-vessels, by transudation or diffusion ; for 

 there is no community between the cavities of the air 

 tubes and cavities of the canals ; that is to say, no open- 

 ing from one into the other (supra, D). 



On the words " KOIVOS TTO/JO? " Aubert and Wimmer 

 remark (I. c. p. 239), " Da A. die Ansicht hat die Lungen- 

 luft wiirde dem Herzen zugefuhrt, so postulirt er statt 

 vieler kleiner Yerbindungen einen grossen Yerbindungs- 

 gang zwischen Lunge und Herz." 



But does Aristotle make this assumption ? The only 

 evidence so far as I know in favour of the affirmative 

 answer to this question is the following passage : 



61 nal ff Kap6ia TTJ apTTjpiq, iri{i%66efft not xovdp66eat nal 

 j di awftprerai, KoZAdv kariv. $vaupivri$ 6k TTJS apT7jpia$ 

 evioic kv ov Karddjjhov iroiei, kv 6 roZf fid^oai T&V ^uv tiffkov on 



rb Trvevfia eif air^v" (i. cap. 16). 

 The heart and the windpipe are connected by fatty and carti- 



