46 VOLUNTARY MOTIONS. SECT, IX. i. 



and with thefe fenfitive motions are aflbciated the 

 adtions of the pe&oral and intercoftal mufcles, and 

 the diaphragm ; till by their united and repeated 

 fucceilions the drop is returned through the larynx. 

 The fame occurs when any thing difagreeably affects 

 the noftrils, or the ftomach, or the uterus ; variety 

 of mufcles "are excited by aflbciation into forcible 

 action, not to be fuppreffed by the utmoft efforts 

 of the will ; as in freezing/ vomiting, and parturi- 

 tion. 



2. In like manner with thefe fenfitive fenfual 

 motions, or ideas of imagination, are affociated 

 many other trains or tribes of ideas, which by fome 

 writers of metaphyfics have been claffed under the 

 terms of refemblance, caufation, and contiguity j 

 and will be more fully treated of hereafter. 



SECT. IX. 



OF VOLUNTARY MOTIONS. 



I. i . Voluntary mufcular motions are originally excited 

 by irritations. 2. And voluntary ideas. Of reajon. 

 II. i. Voluntary mufcular motions are occasionally 

 caufable by fenfations. 2. And voluntary ideas. 111. 

 i. Voluntary mufcular motions are cccafionally obedient 

 to Irritations. 2. And voluntary ideas. IV. i. Vo- 

 luntary mufcular motions are affociated 'with other muf- 

 cular motions. 2. And voluntary ideas. 



WHEN pleafure or pain affecl the animal fyftem, 

 many of its motions both nuifcular and fenfual are 



brought 



