SYSTEMATIC ANALYSIS OF APPARATUS. 75 



also be induced by the mind, it may assist in determin- 

 ing the particular characteristics of examined objects, 

 and thus be a part of the muscular sense, or rather an 

 addition to it. 



218. Inf. Two CLASSES OF NERVES MUST BE FOUND 

 IN THE MUSCLES, one through which influences act on the 

 muscle causing it to contract, and another through which 

 the muscle, by contracting, produces its effect on the 

 Ganglia. 



NERVES RELATED TO MUSCLES \ -- 



\ Sensatory. 



Fig. 76 represents a section of the tiflTliniiilto 

 spinal cord, with 1, 2, the roots, as 

 they are called, of nerves extending 

 from it on each side. 1 is motory, 2 is 

 sensatory , beyond 3 they are enclosed 

 in one sheath, and no longer distin- 

 guishable. All the spinal nerves are 

 similar. Where they arise from the 

 spinal cord, they are seen to be nu- 

 merous ; they are equally so in their 

 sheath. 



219. Inf. NERVES are only channels for conducting 

 influences. 



220. Inf. THERE MUST BE two kinds of Ganglia 

 for the muscles, one to exert an influence through, and 

 another to receive one from, the two kinds of nerves. 



221. Inf. THE MUSCLES are both sensatory and 

 motory they must be the latter in order to be the former 

 and the control of them as motory organs is dependent 

 on their sensory action. 



222. A REVIEW OF ALL THE SENSATORY APPARATUS 



will show that each kind is composed of three organs, 

 as follows : 



Organ of Sense ; Nerve ; Ganglion ; 

 and that 



223. THE SENSATORY APPARATUS is of two classes, 

 one wholly devoted to the internal condition of the body, 

 its organs of sense corresponding to all the organs of 

 the body ; the other devoted to gaining for the mind 



218. What ? Table. Describe Fie. 76. 219. What are ? 220. How many 

 kinds of Qanglia related to muscles ? 221. What are ? 222. shows what ? 



