SYSTEMATIC ANALYSIS OF THE BODY. 29 



BRAIN requires the most considerate protection from 

 MOAVS not merely, but from jars even, and also from the 

 slightest inequalities of temperature. 



33. THE GANGLIA OF THE BRAIN find ample protec- 

 tion in the Walls of the Head, in which also are lodged 

 the organs of observation needed by the Mind in explor- 

 ing the External World, and by which it is warned of 

 dangers yet at a distance the upper and back parts of 

 the wall being covered by the warmth-preserving hair. 



34. THE FRAME OF THE HEAD is divisible into 

 those parts that constitute the lower and front part, 

 called the Faciiim, in which are the Organs of Observa- 

 tion (organs of sense) ; and the upper and back part, 

 called the Cranium, and which encloses the brain. 



35. THE ORGANS FOR OBSERVATION may with pro- 

 priety be classed with the Contents of the Walls, as 

 they are special to the head, their like not being needed 

 or found in any other part of the body. 





Ganglia. 





VP 



Nose. 



Mouth. 



37. THE EAR, EYE, NOSE, AND MOUTH MUST BE CON- 

 NECTED with the central Ganglia, as they are, by white 

 pulpy cords called Nerves, and all the special organs 

 must be supplied with blood through tubes interwoven 

 throughout. These are called general organs, because 



they exist in various parts of the body. 



" Ganglia. 



f Special 



38. THE WHOLE CONTENTS of] 

 the Walls of the Head are 1 



Ear. 

 Eye. 



Nose. 

 Mouth. 



39. THE PROPER WALLS OF THE HEAD ARE COMPOS- 

 ED of, 1st, a strong Framework, called the Skull or Skel- 

 eton of the Head ; 



33. What do find? 84. How is divisible? 35. How may ~ be classed? 

 36. What are ? 37. How must ? 38. What are ? 89. Of what are ~- 1st? 



