126 VASCULAR SYSTEM. 



MI. VASCULAR SYSTEM WITH BLACK BLOOD. 



Situation, Forms, Division, and General Arrange- 

 ment. 



Q. How is this system divided? 



t#. Into two distinct ones. The general black blood 

 system, and the black blood system of the abdomen. 



Q. What proof is there that blood is not formed in the 

 general capillary system ? 



*ft. The fact that no veins arise from parts where arte- 

 ries are not sent. 



Q. What are the two orders of veins? 



/2. Those which accompany the arteries, and those 

 which are superficial, sub-cutaneous. 



Q. Where do the veins originate? . 



#. From the general capillary system. 



Q. Is the arterial system or the venous most capa- 

 cious? 



t/2. The venous is much more capacious than the arte- 

 rial; there is no fixed disproportion. 



Q. On what does the continuance of the circulation de- 

 pend? 



A. On a due relation between the capacity of the sys- 

 tems of red and black blood, and also between the velo- 

 city with which the blood is propelled; and on a similar 

 relation between the origins, agents of impulse, and ter- 

 minations of the two circulations. 



Q. Which side of the heart contains most blood after 

 death, and what is the reason ? 



