48 PHYSIOLOGY. 



which formerly attended the sensations themselves, and, particu- 

 larly, to renew the emotions of mind, or motions of the body, 

 which the sensations formerly produced. 



LXXI. Most of our sensations, perhaps all of them, are 

 either pleasant or painful. 



LXXI I. The words pleasant and painful are commonly ge- 

 neric terms, each of them comprehending a great many species 

 which seem to require being assorted under several different ge- 

 nera. Thus, in the first place, our sensations may be divided 

 into those we desire, and those we are averse to. Of those we 

 desire, we may distinguish those which arise from qualities we 

 refer to other bodies, from those we refer entirely to our own. 

 The first may be named, more strictly, the AGREEABLE the 

 last, the PLEASANT. In like manner, of the sensations we are 

 averse to, we may distinguish the DISAGREEABLE and the PAIN- 

 FUL. But, farther, the last must be distinguished from that 

 sense of aversion which accompanies certain sensations of con- 

 sciousness, as the sense of debility, lassitude, difficulty, &c. ; 

 and, particularly, from that which is referred obscurely to inter- 

 nal parts, and this we name ANXIETY. These sensations may be 

 called the UNEASY ; and every one distinguishes this kind from 

 that of the PAINFUL, more strictly so called. These last seem 

 to be always sensations of impression, referred pretty accurately 

 to a particular part. 



There is thus a foundation for establishing different genera 

 of the sensations we desire, and of those we are averse to ; as 

 also, for greater precision in the employment of terms. But the 

 fixing the limits of these genera, and assorting the several spe- 

 cies, may be still difficult ; so that we cannot be certain of ap- 

 plying the terms every where with strict propriety. 



LXXIII. The enumeration of the agreeable or disagreea- 

 ble, and even of the pleasant sensations, would not be of much 

 use here ; and the enumeration of the uneasy and painful, 

 though much more interesting, belongs to the Pathology. " (See 

 page 54.)" However, we think it proper to deliver here the 

 few following propositions. 



LXXIV. Sensation and action, within certain limits, are 

 always desired ; and the want of sensation, or imperfect and in- 

 distinct sensations, are always uneasy. In action, of every kind, 



