CLASS II, 1. 1. OF SENSATION, 151 



CLASS II. 



DISEASES OF SENSATION- 



ORDO I. 



Increased Sensation, 

 GENUS I. 



With increased Action of the Muscles. 



THE actions belonging to this genus are those which are im- 

 mediately excited by the sensations of pain or pleasure, but 

 which are neither followed by inflammation nor by convulsion. 

 The former of which belong to the subsequent genera of this 

 Grder, and the latter to the class of voluntary motions. 



The criterion between the actions, which are the immediate 

 consequence of painful sensation, and convulsive actions pro- 

 perly so called, consists in the former having a tendency to dis- 

 lodge the stimulating cause, which induces the painful sensation; 

 and the latter being exerted for the purpose of expending the 

 sensorial power, and thus dulling or destroying the general sen- 

 sation of the system. See Class III. 1. 



There is a degree of heat produced in the affected part by 

 these sensitive actions without inflammation, but in much less 

 quantity than when attended by inflammation; as in the latter 

 there is production of new vessels. See Sect. XXXIII. 2. 3. 



Some of the species of this genus cannot properly be termed 

 diseases in their natural state, but become so by their defect or 

 excess, and are here inserted to facilitate the explanation of the 

 others. 



SPECIES. 



1. Deglutitio. Swallowing our food is immediately caused 

 by the pleaurable sensation occasioned by its stimulus on the 

 palate or fauces, and is acquired long before the nativity of the 

 animal. Afterwards the pain of hunger previously produces 

 the various voluntary exertions to procure the proper material, 

 but the actions of masticating and of swallowing it are effected 

 by the sensorial power of sensation; which appears by their not 

 being always controllable by the will, as when children in vain 

 attempt to swallow nauseous drugs. See Class IV. 1. 3. 1, 



