CLASS IV, 1. 1. OF ASSOCIATION. 361 



D. ^Associations affected by other Sensorial Motions. 



Circles and trains of associate motions are also liable to be af- 

 fected by their catenations with other sensorial powers, as of ir- 

 ritation, or sensation, or volition; which other sensorial powers 

 either thus simply form some of the links of the catenation, or add 

 to the energy of the associated motions. Thus when vomiting 

 is caused by the stimulus of a stone in the ureter, the sensation of 

 pain seems to be a link of the catenation rather than an efficient 

 cause of the vomiting. But when the capillary vessels of the 

 skin increase their action from the influence of external heat, 

 they are excited both by the stimulus of unusual heat, as well 

 as by the stimulus of the blood, and by their accustomed associa- 

 tion with the actions of the heart and arteries. And lastly, in 

 the blush of anger the sensorial power of volition is added to that 

 of association, and irritation, to excite the capillaries of the face 

 with increased action. See Class IV. 2, 3. 5. 



E. Associations catenated with Sensation. 



Pain frequently accompanies associate trains or circles of mo- 

 tion without its being a cause, or a link, of them, but simply an 

 attendant symptom; though it frequently gives name to the dis- 

 ease, as head-ach. Thus in the cramp of the calves of the legs 

 in diarrhoea, the increased sensorial power of association is the 

 proximate cause; the preceding increased action of the bowels is 

 the remote cause; and the proximate effect is the violent contrac- 

 tions of the musculi gastrocnemii; but the pain of these muscles 

 is only an attendant symptom, or a remote effect. See Sect. 

 XVIII. 15. Other sensitive associations are mentioned in Class 

 IV. 1.2. andIV.n.2. 15. 



Thus, if the flushing of the face above mentioned after dinner 

 be called a disease, the immediate or proximate cause is the in- 

 creased power of association, the remote cause is the increased 

 irritative motions of the stomach in consequence of the stimulus 

 of food and wine. The disease or proximate effect consists in 

 the increased actions of the cutaneous vessels of the face; and 

 the sensation of heat, the existence of heat, and the red colour, 

 are attendants or symptoms, or remote effects, of the increased 

 actions of these cutaneous vessels. 



F. Direct and reverse Sympathy. 



The increased actions of the primary part of the trains of as- 

 sociated motions are sometimes succeeded by increased actions 

 VOL. n. 3 A 



