CIASS IV. 1. 1. OF ASSOCIATION. 359 



CLASS IV. 



DISEASED ASSOCIATIONS. 



ORDO I. 



Increased Associate Motions. 



GENUS I. 

 Catenated with Irritative Motions. 



The importance of the subsequent class not only consists in 

 its elucidating all the systematic diseases, but in its opening a 

 road to the knowledge of fever. The difficulty and novelty of the 

 subject must plead in excuse for the present imperfect state of 

 it. The reader is entreated previously to attend to the follow- 

 ing circumstances for the greater facility of investigating their 

 intricate connections; which I shall enumerate under the follow- 

 ing heads. 



A. Associate motions distinguished from catenations. 



B. Associate motions of three kinds. 



C. Associations affected by external influences. 



D. Associations affected by other sensorial motions. 



E. Associations catenated with sensation. 



F. Direct and reverse sympathy. 



G. Associations affected four ways. 

 H. Origin of associations. 



I. Of the action of vomiting. 

 K. Tertian associations. 



A. Associate Motions distinguished from Catenations. 



Associate motions properly mean only those, which are caused 

 by the sensorial power of association. Whence it appears, that 

 those fibrous motions, which constitute the introductory link of 

 an associate train of motions are excluded from this definition, as 

 not being themselves caused by the sensorial power of associa- 

 tion, but by irritation, or sensation, or volition, I shall give for ex- 

 ample the flushing of the face after dinner; the capillary vessels 

 of the face increase their actions in consequence of their catena- 

 tion, not their association, with those of the stomach; which latter 

 are caused to act with greater energy by the irritation excited by 

 the stimulus of food. These capillaries of the face are associated 



