DISEASES CLASS IV. 2. 2. 9. 



mences, which by inflaming the membranes of the teeth may 

 prevent their irritative fympathy with thpfe 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 difeafes may be cured, by difuniting the irrita- 

 tive fympathy between thofe parts, which may not poflefs any 

 fenfitive fympathy. This idea is well worth our attention. 



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

 thy of the membranes of the ear with thofe which inveft or fur- 

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

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

 of opium. See Clafs I. 2. 4. 



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

 faeces and urine the mufcles of the moulders are exerted to com- 

 prefs the air in the lungs, that the diaphragm may be prefTed 

 down. Hence the diftention of the tendons or fibres of thefe 

 mufcles is aflbciated with the diftention of the tendons or fibres 

 of the diaphragm ; and when the latter are pained by the en- 

 largement or heat of the inflamed liver, the former fympathize 

 with them. Sometimes but one fhoulder is affected, fometimes 

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

 rheumatic, have a fimilar origin, viz. from fenfitive aflbciar 

 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 link 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 (houl- 

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

 their ufual fhare, and confequently fall into torpor. 



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

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

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

 This I afcribe to fenfitive afTociation 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 firft 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 

 of the fmall-pox fupervene. 



1 1. Tejlium 



