THE SEASON WHY. 229 



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

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

 may be full." n JOHN. 



3. The nerves of special sense. 



4. The nerves of sympathy. 



959. What are the nerves of motion? 



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

 stimulate the muscles to act, and apportion the amount of 

 stimulation they convey to the degree of exertion required. 



Fig. 60. MUSCLES OF THE HEAD AND FACE, WITH NERVES DISTRIBUTED 

 THERETO. 



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

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



960. W hat are the nerves of sensation ? 



The nerves of sensation are those which impart a consciousness 

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

 obeyed, and how far they have been fulfilled. 



