54:6 ABSORPTION. 



the vessels, must favor the current toward the venous system. 

 The alternate dilatation and compression of the thoracic duct 

 with the acts of respiration is likewise an aid to the circula- 

 tion, and is more efficient than any other force, except the vis 

 a tergo. The action of the valves is precisely the same in 

 the lymphatic as in the venous syst.em. 



