Class IV. i. i. OF ASSOCIATION. 359 



CLASS IV. 



DISEASES OF ASSOCIATION, 



ORDO L 



Increased AJJbciate Motions. 



GENUS I. 



Catenated with Irritative Motions, 



The importance of the fubfequent clafs not only confifts in 

 its elucidating all the fympathetic difeafes, but in its opening a 

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

 fubject muft plead in excufe for the prefent imperfect, ftate of 

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

 ing circumftances for the greater facility of inveftigating their 

 intricate connections ; which I fhall enumerate under the fol- 

 lowing heads. 



A. AiTociate motions diftinguifhed from catenations. 



B. Affociate motions of three kinds. 



C. AiTociations affected by external influences. 



D. AiTociations affected by other fenforial motions. 



E. AiTociations catenated with fenfation. 



F. Direct and reverfe fympathy. 



G. AiTociations affected four ways. 

 H. Origin of aiTociations. 



I. Of the action of vomiting. 

 K. Tertian aiTociations. 



A. Affociate Motions dijiingui/fjed from Catenations. 



AiTociate motions properly mean only thofe, which are caufed: 

 by the fenforial power of affociation. Whence it appears, that 

 thofe fibrous motions, which conftitute the introductory link of 

 an afTociate train of motions, are excluded from this definition, 

 as not being themfelves caufed by the fenforial power of affocia- 

 tion, but by irritation, or fenfation, or volition. I fhall give for ex- 

 ample the fluihing of the face after dinner ; the capillary veffels of 

 the face increafe their actions in confequence of their catenation, 

 not their affectation, with thofe of the ftomach ; which latter are 

 caufed to act with greater energy by the irritation excited by 

 the flimulus of food. Thefe capillaries of the face are affocia- 



ted 



