64 GENERAL ANALYSIS. 



156. THE GENERAL ORGANS OF THE BODY, in which 

 the outer ends of the sensatory nerves exist, do not re- 

 quire any peculiar adaptation to their sensatory office or 

 function ; all that is necessary is to have the nerves 

 commence in, and thus connect every part with, the 

 Ganglia; then, whatever the condition of the organ, a 

 corresponding effect can be produced in the nerve, and 

 a corresponding activity in its Ganglion, and a corre- 

 sponding sensation. 



157. Illus. If any part be in health, it causes a 

 delightful sensation ; if diseased, an unpleasant sensa- 

 tion ; if it require food, a sensation of hunger ; if drink, 

 a sensation of thirst ; if too warm or too cold, appropriate 

 sensations ; and thus of all other states, through scores 

 of varieties and hundreds of shades. 



158. A VERY NATURAL QUESTION WOULD BE, If all 



the sensations are produced in the head by the activity 

 of the Ganglia, how can it be determined that they are 

 caused in one part rather than another ? 



159. TO DETERMINE IN WHAT PART ANY SENSATION 



HAS BEEN CAUSED, it is only necessary to have the mind 

 believe, when it has a sensation, that it was caused at 

 the outer end of the nerve through which the activity 

 of the Ganglion has been caused. This is the case, and 

 the act is called perceiving the sensation. 



160. Illus. WHEN A PERSON STRIKES THE ELBOW, 

 or funny bone, he says he ftfels a sensation in his lit- 

 tle finger, but he does not ; he strikes a nerve (a, Fig. 

 43) between the skin and bone of the elbow, which 

 nerve commences by numerous branches in his little fin- 

 ger, and extends to the Ganglia. When struck, this 

 nerve excites the Ganglia and causes a sensation that 

 the mind refers to the part in which the outer end of the 

 nerve is ; that Is, the Mind perceives the sensation in the 

 finger, or as if it was in the finger. 



161. Illus. WHEN A PERSON BY LONG SITTING 

 COMPRESSES THE NERVE (&, Fig. 43) between the seat 



156. "What do requirn? 157. How illustrated? 158. What would be? 

 159. What necefesary ? 160. What effect ? 161. What effect ? 



