SECT. IX. 4. VOLUNTARY MOTIONS. 49 



from the Leyden phial along its rnufcles ; and that 

 even though the limb is paralytic. The fudden 

 motion of the arm produces a difagreeable fenfation 

 in the joint, but the mufcles feein to be brought 

 into aclion (imply by irritation. 



2. The ideas, that are generally fubfervient to 

 the will, are in like manner occafionally excited by 

 irritation ; as when we view again an object, we 

 have before well ftudied, and often recollected. 



IV. i. Innumerable trains or tribes of motions 

 are affociated with thefe voluntary mufcular mo- 

 tions above mentioned ; as when I will to extend 

 my arm to a diftant object, fome other mufcles are 

 brought into action, and preferve the balance of 

 my body. And when I wi(h to perform any fleady 

 exertion, as in threading a needle, or chopping 

 with an ax, the pectoral mufcies are at the iame 

 time brought into action to preferve the trunk of 

 the body motionlefs, and we ceafe to refpire for a 

 time. 



2. In like manner the voluntary fenfual motions, 

 or ideas of recollection, are affociated with many 

 other trains or tribes of ideas. As when I volunta- 

 rily recollect a gothic window, that I faw fome time 

 ago, the whole front of the cathedral occurs to me 

 at the fame time. 



SECT. 



