SECT. II. 2. , DEFINITIONS. 13 



voluntarily recall are here termed ideas of recollefti- 

 cn, a?, when we will to repeat the alphabet back- 

 wards. And thofe ideas which are fuggefted to us 

 by preceding ideas are here termed ideas of Juggejl- 

 ion, as whilft we repeat the alphabet in the ufual or- 

 der ; when by habits previoufly acquired B is fug- 

 gefted by A, and C by B, without any effort of 

 deliberation. 



1 1. The word affectation properly fignifies a fociw- 

 ety or convention of things in fome refpects iirnilar 

 to each other. We never fay in common language, 

 that the effect is affociated with the caufe, though 

 they neceffarily accompany or fucceed each other. 

 Thus the contractions of our mufcles and organs of 

 fenie may be faid to be affociated together, but can- 

 not with propriety be faid to be affociated with irri- 

 tations, or with volition, or with fenfation ; becaufe 

 they are caufed by them, as mentioned in Sect. IV. 

 When fibrous contractions fucceed other fibrous con- 

 tractions, the connection is termed aff&ciation ; when 

 fibrous contractions fucceed fenforlal motions, the 

 connection is termed caufation ; when fibrous and 

 fenforial motions reciprocally introduce each other 

 in progrefiive trains or tribes, it is termed catenation 

 of animal motions. All thefe connections are faid 

 to be produced by habit \ that is, by frequent repe- 

 tition. 



1 2. It may be proper to obferve, that by the un* 

 avoidable idiom of our language the ideas of per- 

 ception, of recollection, or of imagination, in the 

 plural number fignify the ideas belonging to percep- 

 tion, to recollection, or to imagination ; whilft the 

 idea of perception, of recollection, or of imagina- 

 tion, in the fingular number is ufed for what is 

 termed " a reflex idea of any of thofe operations 

 of the fenforium." 



13. By the wordflimulus is not only meant the 

 application of external bodies to our organs of fenfe 



and 



