SYSTEMATIC SYNTHESIS OF OKGANS INTO APP. 379 



ing sensation, and, in fact, is constantly thus acting ; for the very com- 

 fortable sensation of health is merely the aggregate result of the healthy 

 action of all parts. Only a part of the organs of the body are volun- 

 tarily applied to receiving sensations, and these are what are usually 

 included under the head of Sensatory Apparatus. 



1201. THE VOLUNTARY SENSATORY APPARATUS IN- 

 CLUDES organs of sense, nerves, ganglia, and portions of 

 the skeleton. 



1202. Remark. Though the organs of sense are the most conspic- 

 uous parts of the Sensatory Apparatus, they are by no means the only 

 essential parts. Indeed, EVERY VARIETY OF SENSATION MAY BE PRODUCED 

 by ganglia alone, but cannot be by nerves or organs of sense alone, 

 those organs being merely the means of exciting the ganglia to action. 



1203. Illus. When the organs of sense are removed, or nerves 

 cut or diseased, the ganglia can still act and produce sensations. In 

 dreams also the ganglia, being active, cause sensations of all kinds, 

 objects being apparently seen and directions perceived as in real vision. 

 In delirium tremens unreal sights, sounds, and other sensations are as 

 vivid as if there was a cause outside the brain. The sensations are real, 

 of course, but the apparent cause is not. In nervous headaches light 

 appears to glimmer before the eyes, rumbling sounds are heard in the 

 ears, etc. In these cases rest and a restored condition of the digestory 

 organs will often remove the cause that is acting on the ganglia. 



1204. Inf. EXERCISE OF THE SENSATORY APPARATUS INCLUDES that 

 of its ganglia and nerves, as well as that of the organs of sense. 



1205. THE EXQUISITE SENSATIONS that result from 

 the proper culture of the senses are CHIEFLY DUE to the 

 proved condition of their ganglia and the mind. 



1206. Illus. IMPERFECT MELODY may be the fault of the ear alone, 

 but the CHARMS OF HARMONY depend upon the relations between the gan- 

 glia and mind ; melody may be appreciated, and harmony not be. Col- 

 ors may be accurately distinguished, yet their most exquisite blending 

 cause no especial delight, on account of defect hi the ganglia. 



1207. THE VOLUNTARY SENSATORY APPARATUS may 

 be subdivided into as many kinds as there are organs 

 of sense, viz., six ; and the appropriate exercise of each 

 develops its perfection, both in skill and in affording 



1201 What does - ? 1202. How ? 1203. When do ganglia act? 1204. What 

 does _ ? 1205. To what are ? 1206. What said of ? 1207. How divide ? 



