CLASS IV. i. r; OF ASSOCIATION. 359 



CLASS IV. 



DISEASES OF ASSOCIATION. 



ORDO I. 



Increafed Ajficiate 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 mult 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 (hall enumerate under the fol- 

 lowing heads. 



A. Affociate motions diftinguifhed from catenations. 



B. Aflbciate motions of three kinds. 



C. Aflbciations affected by external influences. 



D. Aflbciations affected by other fenforial motions. 



E. Aflbciations catenated with fenfation. 



F. Direct and reverfe fympathy. 



G. Aflbciations affected four ways. 

 H. Origin of aflbciations. 



I. Of the action of vomiting. 

 K. Tertian aflbciations. 



A. Affociate Motions diftingitijhed from Catenations. 



Aflbciate motions properly mean only thofe, which are caufed 

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

 thofe fibrous motions, which conftitute the introductory link of 

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

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

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

 ample theflulhing of the face after dinner ; the capillary vefltls of 

 the face increafe their actions in confequence of their catenation, 

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

 caufed to act with greater energy by the irritation excited by 

 the (timulus of x food. Thefe capillaries of the face are aflbcia- 



ted 



