324 DISEASES Sect. XXXIV. i. f. 



SECT. XXXIV. 



DISEASES OF VOLITION. 



I. I . Volition defined. Motions termed involuntary are caufed by 

 volition. Defires oppofed to each other. Deliberation. Afs be-> 

 tiveen two hay-cocks. Saliva /wallowed againfi one's defire. 

 Voluntary motions dijlinguijhed from thofe ajfociated with fenfttive 

 motions. 2. Pains from excefs, and from defetl of motion. No 

 pain is felt during vehement voluntary exertion ; as in cold fits of 

 ague, labour-pains ,' fir angury, tenefmus, vomiting, refllejfnefs in 

 fevers, convulfion of a wounded mufcle. 3. Of holding the breath 

 andfcreaming in pain ,- why fwine and dogs cry out in pain, and 

 not fiheep and horfes. Of grinning and biting in pain ; why mad 

 animals bite others. 4. Epileptic convulfions explained, why the 

 fits begin with quivering of the under jaw, biting the tongue, and 

 fitting the teeth ; why the convulfive motions are alternately relax- 

 ed. The phenomenon of laughter explained. Why children can- 

 not tickle themfelves. How fome have died from immoderate 

 laughter. 5. Of cataleptic fpafms, of the locked jaw, of painful 

 cramps. 6. Syncope explained. Why no external objects are 

 perceived in fyncope. 7. Of palfy and apoplexy from violent exer- 

 tions. Cafe of Mrs. Scot. From dancing, fcating, fwitnming. 

 Cafe of Mr. Nairne. Why palfies are not always immediately 

 preceded by violent exertions. P^lfy and epilepfy from difeafed 

 livers. Why the right arm mote frequently paralytic than the 

 left. How paralytic limbs regain their motions. II. Difeafes of 

 the fenfual motions from excefs or defetl of voluntary exertion. 

 I. Madnefs. 2. Difiinguifhed from delirium 3. Why man- 

 kind more liable to infanity than brutes. Sufpicion. Want of 

 Jhame, and of cleanlinefs. 5. They bear cold, hunger, and fa tigut. 

 Charles XII. of Sweden. 6. Pleafurable delirium, and infinity. 

 Child riding on a flick. Pains of martyrdom not felt. 7. Drop- 

 fy. 8. Inflammation cured by infanity. III. 1. Pain relieved 

 by reverie. Reverie is an exertion of voluntary and fenfttive mo- 

 tions. 2. Cafe of reverie. 3. Lady fuppo fed to have two fouls. 

 4. Methods of relieving pain. 



I. 1. Before we commence this Section en Difeafed Volt 

 untary Motions, it maybe neceflary to premife, that the word 

 volition is not ufed in this work exactly in its common accepta- 

 tion. Volition is faid in Seftion V. to bear the faii^e analogy to 

 defire and averfion, which fenfution does to pleafure and pain. 

 And hence that, when defire or averfion produces any adtion of 



the 



