52 ASSOCIATE MOTIONS. SECT. X. 3. 



times indiflbluble but with life. Hence the idea of 

 an inhuman or difhonourable action perpetually 

 calls up before us the idea of the wretch that was 

 guilty of it. And hence thofe unconquerable anti- 

 pathies are formed, which forne people have to the 

 fight of peculiar kinds of food, of which in their in- 

 fancy they have eaten to excefs or by conftraint. 



III. i. In learning any mechanic art, as mufic, 

 dancing, or the ufe of the fword, we teach many 

 of our mufcles to act together or in fucceflion by 

 repeated voluntary efforts ; which by habit become 

 formed into tribes or trains of aflbciation, and ferve 

 all our purpofes with great facility, and in fome in- 

 fiances acquire an indiflbluble union. Thefe mo- 

 tions are gradually formed into a habit of acting to- 

 gether by a multitude of repetitions, whilft they 

 are yet feparately caufable by the will, as is evident 

 from the long time that is taken up by children in 

 learning to walk and to fpeak ; and is experienced 

 by every one, when he firil attempts to fkate upon 

 the ice or to fwim; thefe we lhali term voluntary 

 affociation s. 



2. All thefe mufcular movements, when they are 

 thus aflbciated into tribes or trains, become after- 

 wards not 'only obedient to volition, but to the fen- 

 fations and irritations ; and the fame movement 

 compofes a part of many different tribes or trains 

 of motions. Thus a fingle mufcle, when it acts in 

 confort with its neighbours on one fide, aflifts to 

 move the limb in one direction ; and in another, 

 when it acts with thofe in its neighbourhood on the 

 other fide ; and in other directions, when it acts 

 Separately or jointly with thofe that lie immediately 

 under or above it ; and all thefe with equal facility 

 after their aflbciations have been well eftablifhed. 



The facility, with which each mufcle changes 

 from one aflbciated tribe to another, and that 

 either backwards or forwards, is well obfervable 



in 



