84 Additional Notes. 



surprise, if it suddenly dissevers our accustomed habits of motion, 

 and is then more generally attended with disagreeable sensation. To 

 this circumstance attending objects of taste is to be referred what 

 is termed wild and irregular in landscapes, in contradistinction to the 

 repetition of parts or uniformity spoken of below. We may add, that 

 novelty of notes and tones in music, or of their combinations or suc- 

 cessions, are equally agreeable to the ear, as the novelty of forms and 

 colours, and of their combinations or successions are to the eye; but 

 that the greater quantity or degree of novelty, the sentiment of which 

 is generally termed Surprise, is more frequently excited by unusual 

 or unexpected sounds; which are liable to alarm us with fear, as well 

 as surprise us with novelty. 



Repetition of visible objects. 



The repeated excitement of the same or similar ideas with certain 

 intervals of time, or distances of space between them, is attended with 

 agreeable sensations, besides that simply of perception ; and, though 

 it appears to be diametrically opposite to the pleasure arising from the 

 novelty of objects above treated of, enters into the compositions of all 

 the agreeable arts. 



The pleasure arising from the repetition of similar ideas with cer- 

 tain intervals of time or distances of space between them is a subject 

 of great metaphysical curiosity, as well as the source of the pleasure 

 derived from novelty, which will I hope excuse its introduction in 

 this place. 



The repetitions of motions may be at first produced either by vo- 

 lition, or by sensation, or by irritation, but they soon become easier 

 to perform than any other kinds of action, because they soon become 

 associated together; and thus their frequency of repetition, if as 

 much sensorial power be produced during every reiteration, as is ex- 

 pended, adds to the facility of their production. 



If a stimulus be repeated at uniform intervals of time, the action, 

 whether of our muscles or organs of sense, is produced with still 

 greater facility or energy; because the sensorial power of association. 



