CHAPTEE XXXV. 



THE SENSES. 



External 

 senses. 



That of 

 heat is 

 distinct. 



The 



muscular 

 sense 



belongs to 

 touch. 



IN the foregoing chapters it has not been necessary to 

 speak of sensations and the consciousness of them 

 further than as general facts : there has been no occasion 

 for discriminating between the various kinds of sensations. 

 But before entering oil the consideration of the complex 

 facts of perception, and of our conceptions of time and 

 space, it will be necessary to consider the peculiarities of 

 the various senses, and of the various ways in which they 

 are related to the mind. For the analysis of the more 

 general facts of mind, it is only necessary to take into 

 account the general fact of sensation ; but for the analysis 

 of the more special facts of mind, we must also take 

 into account the special facts of the various senses. 



It is not necessary in the present chapter to make any 

 further mention of the visceral sensations, such as hunger 

 and thirst, and the sensations of being weU or ill. For 

 the present purpose we have to do only with the external 

 senses ; that is to say, those senses by means of which 

 we obtain information concerning things external to the 

 sentient organism. 



The external senses are usually enumerated as five ; 

 namely, touch, taste, smell, sight, and hearing. The sense 

 of heat, however, is really a distinct sense, though it has 

 its seat in the same nerves with the sense of touch. The 

 " muscular sense," or sense of muscular action, is classed 

 by many as a distinct sense ; but I shall state my reasons 

 for regarding it as not really separable from the sense of 



