ERRORS ATTRIBUTED TO ARISTOTLE. 189 



of them which are in contact (TTJV avva^iv} the air passes in and they 

 [the Tr6poi] carry it to the heart. 



(E) " One of the canals leads to the right cavity, the other to 

 the left." 



(F) " Of all the viscera, the heart alone contains blood [in itself]. 

 The lung contains blood, not in itself but in the veins, the heart in 

 itself ; for in each of the cavities there is blood ; the thinnest is in 

 the middle cavity." 



Book iii. 3. (Cf) " Two veins lie in the thorax alongside the 

 spine, on its inner face; the larger more forwards, the smaller 

 behind ; the larger more to the right, the smaller, which some call 

 aorta (on account of the tendinous part of it seen in dead bodies), 

 to the left. These take their origin from the heart; they pass 

 entire, preserving the nature of veins, through the other viscera 

 that they reach ; while the heart is rather a part of them, and more 

 especially of the anterior and larger one, which is continued into 

 veins above and below, while between these is the heart. 



(ZT) "All hearts contain cavities, but, in those of very small 

 animals, the largest [cavity] is hardly visible, those of middling 

 size have another, and the biggest all three. 



(/) "The point of the heart is directed forwards, as was men- 

 tioned at first; the largest cavity to the right and upper side of it, 

 the smallest to the left, and the middle-sized one between these; 

 both of these are much smaller than the largest. 



(JT) "They are all connected by passages (awTlrpjjvTai) with 

 the lung, but, on account of the smallness of the canals, this is 

 obscure except in one. 



(Z) "The great vein proceeds from the largest cavity which 

 lies upwards and to the right; next through the hollow middle part 

 (6ia TOV Kolfov TOV utoov} it becomes vein again, this cavity being a 

 part of the vein in which the blood stagnates. 



(M ) " The aorta [proceeds from] the middle [cavity], but not in 

 the same way, for it is connected [with the middle cavity] by a 

 much more narrow tube (avptyya). 



(N~) "The [great] vein extends through the heart, towards the 

 aorta from the heart. 



(0) "The great vein is membranous like skin, the aorta nar- 

 rower than it and very tendinous, and as it extends towards the head 

 and the lower parts it becomes narrow and altogether tendinous. 



(P) " In the first place, a part of the great vein extends up- 



