Class IV. 3. 2. x. OF ASSOCIATION. 439 



ORDO III. 



Retrograde AJfociate Motions. 



GENUS II. 



Catenated with Senjltive Motions, 



SPECIES. 



i. Naufea idea/is. Naufea from difguftful ideas, as from 

 naufeous ftories, or difguftful fights, or fmells, or taftes, as well 

 as vomiting from the lame caufes, con fids in the retrograde ac- 

 tions of the lymphatics of the throat, and of the cefophagus, and 

 itomach ; which are aflbciated with the difguftful ideas, or fen- 

 fual motions of fight, or hearing, or fmell, or tafte •, for as thefe 

 are deareafed motions of the lymphatics, or of the cefophagus, or 

 ftomach, they cannot immediately be excited by the fenforial 

 power of painful fenfation, as in that cafe they ought to be in- 

 creafed motions. So much fenforial power is employed for a 

 time on the difguftful idea, or expended in the production of 

 inactive pain, which attends it, that the other parts of the aflb- 

 ciated chain of action, of which this difguftful idea is now be- 

 come a link, are deprived of their accuftomed (hare ; and there- 

 fore firft flop, and then invert their motions. Owing to defi- 

 ciencv of fenforial power, as explained more at large in Sect. 

 XXXV. 1. 3. 



2. Naufea a conceptu. The naufea, which pregnant women 

 are lo fubject to during the firft part of geftation, is owing to 

 the reverfe fympathy between the uterus and ftomach, fo that 

 the increafed action of the former, excited by the ftimulus of 

 the growing embryon, which I believe is fometimes attended 

 with fenfation, produces decreafed actions of the latter with the 

 difagreeable fenfation of ficknefs with indigeftion and confe- 

 quent acidity. When the fetus acquires fo much mufcular 

 power as to move its limbs, or to turn itfelf, which is called 

 quickening, this ficknefs of pregnancy generally ceafes. 



M. M. Calcined magnefia. Rhubarb. Half a grain of opi- 

 um twice a day. Recumbent pofture on a fofa. 



3. Vomitio vertiginofa. Sea-ficknefs, the irritative motions of 

 vifion, by which we balance ourfelves, and preferve our perpen- 

 dicularity, are difturbed by the indiftinclnefs of their objects ; 

 which is either owing to the fimilarity of them, or to their dif- 



tance, 



