ERRORS ATTRIBUTED TO ARISTOTLE. 



191 



Lsv 



VI. 



A dog having been killed by chloroform, enough of the right wall of 

 the thorax was removed, without any notable bleeding, to expose the 

 thoracic viscera. A carefully measured outline sketch of the parts in 

 situ was then made, and on dissection, twenty-four hours afterwards, 

 the necessary anatomical details were added. The woodcut is a faith- 

 fully reduced copy of the drawing thus constructed ; and it represents 

 the relations of the heart and great vessels as Aristotle saw them in a 

 suffocated animal. 



All but the inner lobe of the right lung has been removed ; as well as the 

 right half of the pericardium and the right walls of the right auricle 

 and ventricle. It must be remembered that the thin transparent peri- 

 cardial membrane appears nothing like so distinct in nature. 



a.6., Aristotle's " great vein " ; F.7., right vena innominata and vena cava 

 superior ; 6, the inferior vena cava ; R.a., the " hollow middle " part of 

 the great vein or the right auricle ; R.v', the prolongation of the cavity 

 of the right ventricle R.v towards the pulmonary artery ; tr, one of the 

 tricuspid valves ; PC, the pericardium ; I.sv, superior intercostal vein ; 

 Az, vena azygos; P. A., right pulmonary artery; Br, right bronchus; 

 L, inner lobe of the right lung ; (E, oesophagus ; Ao, descending aorta ; 

 J?", liver, in section, with hepatic vein, vena portse, and gall-bladder, <7&, 

 separated by the diaphragm, also seen in section, from the thoracic cavity. 



