474 DISEASES OF VOLITION. SECT. XXXIV. 



SECT, xxxivi 



DISEASES OF 



j. i. Volition defined. Motions termed involuntary 

 are caused by volition* Defires oppofed to each other. 

 Deliberation, 4fs between two hay -cocks. Saliva 

 fwallow'ed again/I Qn$ defire. Voluntary motions 

 dijlinguijhed from thofe ajjociated with /enfttive mo- 

 tions. 2. Pains from excefs, and from defect of 

 motion* No pain is felt during vehement voluntary 

 exertion ; as in cold Jits of ague, laboitr -pains, Jlran- 

 gury, tenefmus, vomiting, rejllejjnefs in fevers, con- 

 vuljion of a wounded mufcle. 3. Of holding the 

 breath and f creaming in pain ; why fwine and dogj 

 cry out in pain y and not Jheep and horfes. Of grin- 

 ning and biting in pain ; why mad animals bite others, 

 4. Epileptic convulfions explained, why the jits begin 

 with, quivering of the under jaw, biting the tongue, 

 andfetting the teeth ; why the convuljive motions art 

 alternately relaxed* The phenomenon of laughter 1 

 explained. Why children cannot tickle themf elves. 

 How fome have died from immoderate laughter., 5. 

 Of cataleptic fpafms, of the locked jaw, of painful 

 cramps. 6. Syncope explained. Why no external 

 objecls are perceived in fyncope. 7. Of pal fy and 

 apoplexy from violent exertions. Cafe of Mrs. Scot* 

 From dancing, f eating, fwimming. Cafe of Mr*> 

 Nairn. Why palfies are not always immediately pre- 

 ceded by violent exertions. Palfy and epilepfy from 

 difeafed livers. Why the right arm more frequently 

 paralytic than the left. How paralytic limbs regain 

 their motions. II. . Dif safes of the fenfual motions 



from 



