110 GENERAL ANALYSIS. 



tilages that compose so large a portion of its walls, to- 

 gether with other muscles that assist them, and no posi- 

 tion in which the Body can be placed will cause pressure 

 on the lungs, except the windpipe be closed. 



396. THE RESPIRATORY ORGANS INCLUDE as follows : 



RESPIRATORY ORGANS = \ (^Pharynx), Windpipe, Lungs, Trunk- 

 / walls, and Diaphragm ; 



and all that is necessary in the respiratory process is 

 pure air, active Trunk-walls and Diaphragm, well-formed 

 Lungs, and a good circulation of Blood through them 

 four distinct topics. 



'Air. 



Trunk-walls and 

 Diaphragm. 

 Lungs. 

 Circulation P. or R. 



RESPIRATORY TOPICS = 



SECTION VIII. 



Digestory Organs. 



397. THE USES OF THE DIGESTORY ORGANS are to 

 supply the Blood with Water and Food, eliminate from 

 and modify the Blood. 



398. WATER ENTERS THE BLOOD and exists in it as 

 water, constituting a very large proportion of it. 



399. WATER REQUIRES NO PREPARATION, and only 

 needs to be swallowed into a pouch, in the sides of which 

 are numerous blood-vessels to drink it in and mingle it 

 with their contents. (See 8, Fig. 70.) 



400. FOOD IS VERY DIFFERENT FROM AlR AND WA- 

 TER in this respect, that these if pure are always the 

 same, and should vary at different times only in quantity, 

 while Food at different times must not only vary in quan- 

 tity, but in character very essentially. 



401. IT is EVIDENT that the different organs of 

 the body require that the Blood should be supplied with 



896. What do What are Respiratory topics? 897. What are T 898. How 

 does - ? 899. Why does - ? 400. How is ? 401. What t 



