168 



THE MOTION OF THE BLOOD. 



four pulmonary veins, and proceeds into their common sinus and 

 the left, or, as it is now more properly termed, posterior, auricle. P 



a, left auricle. 



/>, mitral valve. 



c, left ventricle : a probe 

 is passed through its 

 opening into the aorta. 



" The blood flows next into the corresponding ventricle ; and 



a, left ventricle. 



b, semilunar valves of aorta, 

 c, aorta. 



James Penada, Memorie della^ocieta Italiana, t. xi. p. 555." 



