THE BEASOK WHY. 229 



1 Having many things to write unto you, I would not write with paper and ink ; 

 but I trust to come unto you, aud speak face to face, that our joy 

 may be full." n JOHN. 



3. The nerves of special sense. 



4. The nerves of sympathy. 



959. Wliat are the nerves of motion? 



The nerves of motion are tho9> which, in obedience to the will, 

 ttimulate the muscles to act, and apportion the amount of 

 stimulation they convey to the degree of exertion required. 



Pig. 60. MUSCLES OP THE HEAD AND FACE, WITH STEHVE3 DISTRIBUTED 

 THEEETO. 



A A A. The facial nerve emerging from underneath the ear, and distributing 

 branches to the cheeks, temple, forehead, &c. This nerve excites the muscles 

 of the face, and is chiefly instrumental iu producing the expressions of the 

 countenance under the changing emotions of the mind. 



B 15 B. MMsles by which various motions are imparted to the head, face, 

 tnuth, &c., under the stimulus of the nerves. 



960. W hat are the nerves of sensation ? 



Tlia nerves of sensation are those which impart a consciousness 

 to the brain that its commands to the nerves of motion have been 

 obeyed, and how for they h?ve beeu, fulfilled. 



