96 ELEMENTARY PHYSIOLOGY. 



visible, but in cold weather is condensed and collects 

 on the windows, or can even be seen as it comes with 

 the breath from the nostrils or mouth. It is chiefly 

 the vapor of alcohol which is expelled from the 

 lungs of a person who has used strong drinks, and 

 his breath thus tells the tale of his indulgence. It 

 has been carefully estimated that about one or one 

 and one-fourth pounds of water is daily given off 

 with the breath of a man. 



THE LIVER. 



The liver, and its connection with the 

 tor "oif^an*" P rocess ^ digestion and also the portal 



circulation have been spoken of else- 

 where. But it must also be considered as an excre- 

 tory organ. Its function is not merely to secrete 

 from the blood a fluid needed in the process of 

 digestion, but by so doing it acts as a blood purifier. 

 It is a well established fact, that, in case of a diseased 

 liver, when that organ fails properly to perform its 

 work of secreting the bile, which thus remains in the 

 blood, a disease known as jaundice ensues, and, if 

 this disease is hot checked, the person dies with 

 symptoms of poisoning. 



THE KIDNEYS. 



The kidneys are two bean-shaped bodies, a little 

 more than half as large as the closed fist. They 

 are located in the back part of the abdominal cavity, 

 one on each side of the spinal column. Their shape, 

 size, appearance, color and structure are very 



