OF EXHALATION. 45 



62. All parts of the body may be the seat of -a more or less 

 rapil absorption ; it is by this phenomenon that liquids, intro- 

 duced into the stomach are found, a very short time afterwards, 

 mingled with the venous blood, and that certain vapors, mixed 

 with the air drawn into the lungs, sometimes act upon remote 

 parts of the body, such as the brain, as happens when we breathe 

 alcoholic vapors. It is also by absortion alone, that we can ex- 

 plain how poisons applied to the lips, the eye, or to a slight erosion 

 of the skin, penetrate into the interior of the body, and cause 

 death, often with as much rapidity as if they had been conveyed 

 directly into the stomach. 



63. it is by the absorption, which takes place in the substance 

 of all the organs, that the old materials no longer of use and 

 separated from the living tissues by the nutritive act, are poured 

 into the circulating torrent to be carried out of the body. 



OF EXHALATION AND OF SECRETION. 



64. The blood, in circulating through the body, is not limited 

 tt the nutrition of the organs through which it passes, and to 

 mingling with it absorbed matters ; on passing into certain parts 

 of the body, it abandons a portion of the matters which it contains, 

 and in this way gives birth to peculiar liquids called humors. 



65. This separation of the contained matters from the blood 

 may take place in two ways : by exhalation and by secretion. 



66. EXHALATION is tin; separation of a portion of the most 

 aqueous part oi the blond, which iu some manner, filters through 

 the pa'ictes of the resseh. 



67. The exhaled liquids do not differ much from serum, ex- 

 cept that they contain more water. Sometimes they accumulate 

 in the internal cavities of the body , at others they are diffused 

 over the surface and are evaporated into the air. It is in this way 

 that a considerable quantity of vapor escapes from the lungs, and 

 a very active evaporation takes place upon the surface of the 

 skin. 



C2. Does absorption take place in al 1 parts of the body ? 



63. By what process are those materials which are no longer of use, car- 

 ried out of the body ? 



GJ. Is the office of the blend limited to the nutrition of the organs through 

 which it p s-es? 



65. In how many ways may matters contained in the bl.od be separated 

 from it ? 



6(i. What is exhalation? 



67. What is the nature of the liquid exhaled? What becomes of the ex 

 halations ? 

 4* 



