182 ERRORS ATTRIBUTED TO ARISTOTLE. [LECT. 



those parts of them which are in contact (TTJV o-vva^tv) the 

 air passes in and they [the TTO/OOI] 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. (G) "Two veins lie in the thorax alongside the 

 spine, on its inner face j 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. 



(H) " 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. 



(I) " 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. 



(K) " They are all connected by passages (a-wTtTpyvTai) with 

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

 obscure except in one. 



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

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

 part (8ta TOV KotAov rov fteo-ov) 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 (o-vpiyya). 



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

 the aorta from the heart. 



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

 narrower than it and very tendinous, and as it extends towards 



