BOOK IX. 



PART III. 



Senses. 



To the peripheral portion of the nervous system, belong all 

 the nerves which are sent oft' from the Medulla Spinalis and 

 Encephalon, as well as the Sympathetic. Some of these nerves 

 have a special apparatus attached to their external extremities, 

 for the purpose of augmenting and facilitating their appropri- 

 ate powers of sensation ; of this class are the Olfactory, the 

 Optic, and the Auditory. Others of them, as the nerves of the 

 tongue and of the skin, though they are the means of special 

 sensations, yet the apparatus upon which they are spread is ap- 

 plied to many purposes, more striking and useful, than that of 

 indicating the presence of surrounding bodies. And, lastly, the 

 remaining nerves, being by far the most numerous and large, 

 are distributed to the muscles and to the viscera. 



CHAPTER I. 



OF THE ORGAN OF SMELLING, OR THE NOSE. 



THE senses of Vision and Hearing are so insulated in their 

 offices, that there can be no doubt of the propriety of consider- 

 ing them as belonging to the peripheral portion of the nervous 



