CHAPTER VI. 



CIRCULATORY ORGANS. 



Their Diseases and How to Cure Them. 



Description of the heart, arteries, and veins, inflammator^s 

 diseases, functional and organic diseases of the heart, dis- 

 eases of the arteries, diseases of the veins, diseases of the 



IvYMPHATIC SYSTEM. 



FONDERFUIy as it seems with our present knowledge, it is only 

 a few centuries ago that Harvey discovered the circulation of the 

 blood. Since that time it has been discovered that their is still 

 another system of circulation in the body intimately connected 

 with the blood vessels. That is known as the lymphatic or absorbent 

 system and consists of a series of tubes which absorb and convey to the 

 blood certain fluids. These tubes lead to sac-like structures called lym- 

 phatic glands, through which these fluids pass on their way to the right 

 lymphatic vein and thoracic duct. These lymphatic glands contain 

 lymph which is on its way to the larger trunks undergoing a sort of fil- 

 tration. 



The Heart. Nearly in the center of the chest is a hollow, cone 

 shaped muscular organ called the heart. Its average weight is between 

 six and seven pounds. It extends from near the third to the sixth rib, 

 having the base of the cone near the third rib, and extending downward, 

 backward, and toward the left side. It is suspended from the spine by 

 the large blood-vessels and held in position by the sac in which it is con- 



