= a 
d 
~ 
ae ‘BOTANIC PHYSICIAN. poo 
veins : not for their nutrition, but to receive from the air in the lungs: 
',_- @ Certain principle, necessary for the continuance of life, and wh he 
the arterial_blood distributes to every part of the body, It soon. 
divides into a rieHT and Ler, the right going to the right lung, 
and the leftto the left lung, where they divide into innumerable 
Tamifications, and form a beautiful net-work upon the air vessels, 
_and then terminate in the lung veins. = 
Seaptee S a2 
Scns 
5 = 
- THE ACTION OF THE ARTERIES. 
_ The arteries, by the impulse of the blood from the ventricles of 
the heart, are dilated and irritated, and by means of their musculat 
coat, contract upon the blood, and thus propel it to the glands, mus= 
___¢les. es, membranes, and every part of the body, for their nutre 
es 1 th us Secretions, and then into the veins. "This di- 
latation and contraction is called the putse, which is perceptible ia 
the trunks and hes of the arteries, but not in the fine vessels of 
the surface, except When inflammation is going on. 
OF VEINS. 
_ Veins are membranous canals, which do not pulsate : they gradu- 
_ ally become Jarger as they advance towards the heart, in which they 
‘terminate, and bring back the blood from the arteries. 
_ nate from the extremities : 
"The terminati 
. The very part of the body into the right 
» auricle:—The upper cave vein receives it from the head, neck, 
chest, and upper extremities: the lower cave vein from the abdo- 
and the crown vein receives it from the : 
"| THE UPPER CAVE VEIN. 
~ SAP bis Velneterminiles ithe sanecior Bax RP Ac + 5 yi ae 
This vein t perior part of the right auricle, into 
__ which it evacuates the blood, from the right and left ¢ 
A eihe tiy - S 
_ the single vein. 
~The right and left chest veins 
hest ve ins, and 
he external outer-arm b 
g the little finger, unites w 
to the inner and outer { 
