420 DISEASES Class IV. 2. 2. 5. 



mences, which by inflaming the membranes of the teeth may 

 prevent their irritative fympathy with thofe of the cranium. 

 Thus by inflaming the tendon, which is the caufe of locked jaw, 

 and probably by inflaming the wound, which is the caufe of hy-? 

 drophobia, thofe difeaies maybe cured, by di uniting the irrita- 

 tive fympatb'' between thofe parts, which may not poffefs any 

 fen/ltive fympathy. This idea is well worth our attention. 



Otalgia. Ear-ach is another difeafe occafiened by the fympa- 

 thy c the membranes of the ear with thofe which in veil or fur- 

 round a decaying tooth, as I have had frequent reafon to be- 

 lieve ; and is frequently relieved by filling the ear with tincture 

 pf opium. See Oafs I. 2. 4. 



9. Dolor humeri in hepaiidide. In the efforts of excluding the 

 fseces and urine the muicles of the (boulders are exerted to comr 

 prefs the ah in the lungs, that the diaphragm may be preffed 

 down, r^ence the diltention of the tendons or fibres of thefe 

 mufcles is nfociated wiih the diftention of the tendons or fibres 

 pf the cjiaphragm 5 and when the ;atter are pained by the en-r 

 largernent or heat of the inflamed liver, the former fympathize 

 with them. Sometimes but one fboulder is affected, fometimes 

 both ; it is probable that many other pains, which ars termed 

 rheumatic, have a fimilar origin, viz. from fenfitive affocia- 

 tions. 



As no inflammation is produced in confequence of this pain 

 of the fhoulder, it feems to be owing to inaction of the mem- 

 branous part from defect of the fenforial power of aflbciation, 

 of which the primary lipk is the inflamed membrane of the liv- 

 er ; which now expends fo much of the fenforial power in gen- 

 eral by its increafed action, that the membranes about the moul- 

 der, which are links of aflbciation with it, become deprived of 

 their ufual (hare, and confequently fall into torpor. 



10. Torpor pedum in eruptione variolarum. At the commence- 

 ment of the eruption of the fmall-pox, when the face and bread 

 cf children are very hot, their extremities are frequently cold. 

 This I afcribe to fenfitive aflbciation between the different parts 

 of the fkin *, whence when a part acts too violently, the other 

 part is liable to act too weakly ; and the fkin of the face being 

 affected firit in the eruption of the fmall-pox, the fkin of the 

 feet becomes cold in confequence by reverfe fympathy. 



M. M. Cover the feet with flannel, and expofe the face and 

 bofom to cool air, which in a very fhort time both warms the 

 feet and cools the face ; and hence what is erroneoufly called a 

 rafh, but which is probably a too hafly eruption of the fmall-pox, 

 difappears ; and afterwards fewer and more diftinct eruptions 

 cf the fmall-pox fupervene. 



1 1 . Tejrium 



