12 DEFINITION S, SECT. II. i. 



mufcles, and thofe of the immediate organs of fcnfe. 

 Thefejibrous motions are thus dittinguifhed from the 

 fenforial motions above mentioned. 



6. The external organs of fenfe are the coverings 

 of the immediate organs of fenfe, and are mecha- 

 nically adapted for the reception or tranfmiffion of 

 peculiar bodies, or of their qualities, as the cornea 

 and humours of the eye, the tympanum of the ear, 

 the cuticle of the fingers and tongue. 



7. The word idea has various meanings in the 

 writers of metaphyfic : it is here ufed limply for 

 thofe notions of external things, which our organs 

 of fenfe bring us acquainted with originally ; and is 

 defined a contraction, or motion, or configuration, 

 of the fibres, which conftitute the immediate organ 

 of fenfe ; which will be explained at large in an- 

 other part of the work. Synonymous with the word 

 idea, we mall fometimes ufe the words fenfual mo- 

 tion in contradiftinction to mufcular motion. 



8. The word perception includes both the action 

 of the organ of fenfe in confequence of the impact 

 of external objects, and our attention to that ac- 

 tion ; that is, it expreffes both the motion of the 

 organ of fenfe, or idea, and the pain or pleafure 

 that fucceeds or accompanies it. 



9. 1 he pleafure or pain which neceffarily accom- 

 panies all thofe perceptions or ideas which we at- 

 tend to, either gradually fubfides, or is fucceeded 

 by other fibrous motions. In the latter cafe it is 

 termedy^vT/tf//^, as explained in Sect. V. 2, and VI. 

 2. The reader is intreated to keep this in his mind, 

 that through all this treatife the word fenfation is 

 ufed to exprefs pleafure or pain only in its active 

 Hate, by whatever means it is introduced into the 

 fyftem, without any reference to the ftimulation of 

 external objects. 



10. The vulgar ufe of the word memory is too 

 unlimited for our purpofe : thofe ideas which we 



voluntarily 



