THE MOTION OF THE BLOOD. 



J6? 



a, sinus of right au- 

 ricle. 



b, appendix of right 

 auricle. 



c, original seat of the 

 foramen ovale. 



d, tricuspid valve. 



e, right ventricle. 



"From this anterior, or, in reference to the heart of some 

 animals, right, ventricle, the blood is impelled through the pulmo- 

 nary artery into the lungs: returning from which, it enters the 



a, right ventricle. 



b t semilunar valves of pulmonary ar- 

 tery. 



c, pulmonary artery : the aperture is 

 the commencement of its right 

 branch. 



