SYSTEMATIC ANALYSIS OF THE BODY. 35 



47. THREE MEMBERS of the Body are necessary 

 to allow all that the Head requires in regard to motion. 



SECOND MEMBER OF THE BODY. 



48. THE NECK PERFORMS very similar offices in ref- 

 erence to the head as the trunk does in the same regard ; 

 but in some of its offices the trunk is so different from the 

 neck, which is no part of the head, that it is best to con- 

 sider the neck as a distinct member. 



49. THE USES OF THE NECK are, to elevate the 

 head above the shoulders and allow it considerable lati- 

 tude of motion, to assist in carrying it without jars, to 

 move it vertically, as in affirmative nodding, to rotate it, 

 as in negation, and to move it from side to side. 



50. THE NECK MUST BE COMPOSED of a framework 

 or skeleton of several pieces movable upon each other ; 

 of muscles that by contraction move the head ; of nerves; 

 of skin, and of blood-tubes interwoven throughout ; be- 

 ing the same kind of organs as the general organs of the 

 head, only differing in use, form, and position. 



f Skeleton. 



Muscles. 

 THE NECK -j Nerves. 



Skin. 

 [Blood-tubes. 



THIRD MEMBER OF THE BODY. 



51. THE TRUNK (it should never be called the body, 

 of which it is only a part) has .a double relation to the 

 Head, that of supporting it and that of supplying it 

 with bloo^ 



52. THE TRUNK is DIVISIBLE, like the Head, into 

 two classes of parts, the walls and their contents, corre- 

 sponding to the two classes of ideas or double relations 

 to be found in, it. (See PL 7, Fig. 2.) 



47. For what are necessary? 48. What does ? 49. What are ? 50. How 

 ? Write table of ? 51. What has ? 52. How ? Describe Fig. 2, PI. 7. 



