SECT. X. 2. ASSOCIATE MOTIONS. 5 r 



2. In like manner many of our ideas are origi- 

 nally excited in tribes ; as all the objects of fight, 

 after we become fo well acquainted with the laws 

 of vifion, as to diftinguifli figure and diftance as well 

 as colour ; or in trains, as while we pafs along the 

 objects that furround us. The tribes thus receiv- 

 ed by irritation become affociated by habit, and 

 have been termed complex ideas by the writers of 

 metaphyfics, as this book or that orange. The 

 trains have received no particular name, but thefe 

 are alike affociations of ideas, and frequently con- 

 tinue during our lives. So the tafte of a pine-ap- 

 ple, though we eat it blindfold, recalls the colour 

 and fhape of it ; and we can fcarcely think on foli- 

 dity without figure. 



II. i. By the various efforts of our fenfations to 

 acquire or avoid their objects, many mufcies are 

 daily brought into fucceffive or fynchronous ac- 

 tions ; thefe become ailociated by habit, and re 

 then excited together with great facility, and in 

 many inftances gain indiflbluble connections. So 

 the play of puppies and kittens is a reprefentation 

 of their mode of fighting or of taking their prey ; 

 and the motions of the mufcles neceflary for thofe 

 purpoies become afibciated by habit, and gain a 

 great adroitnefs of action by thefe early repetitions : 

 fo the motions of the abdominal mufcles, which 

 were originally brought into concurrent action with 

 the protrufive motion of the rectum -or bladder by 

 ienfation, become fo conjoined v/ith them by habit, 

 that they not only eafily obey thefe fenfations occa- 

 iioned by the ftimulus of the excrement and urine, 

 but are brought into violent and unreftrainable ac- 

 tion in the ftrangury and tenefmus. This kind 

 of connection we mall term fenfitive aflbciation. 



2. So many of our ideas, that have been excited 

 together or in fucceffion by our fenfations, gain 

 fynchronous or fucceffive aflbciations, that are fome- 



tiaies 



