4 o«a DISEASES Class IV. 2. 1. x. 



too violent aclions of the inflamed membranes of the loofe tooth *, 

 and then by a fecondary fympathy the membranes about the 

 ear and temple became torpid, and painful j and thofe of the 

 alveolar procefs of the upper jaw regained their natural quanti- 

 ty of action, and ceafed to be painful. A great many more nice 

 and attentive obfervations are wanted to elucidate thefe curious 

 circurnftances of ailbciation, which will be found to be of the 

 greateft importance in the cure of many difeafes, and lead us to 

 the knowledge of fever. 



SPECIES. 



\. Cutis frigida pr an for urn. Chillnefs after dinner frequent Jy 

 attends weak people, or thofe who have been exhaufted by exer- 

 cife •, it arifes from the great expenditure of the fenforial power 

 on the organs of digeftion, which are ftimulated into violent 

 aclion bv the aliment ; and the veffels of the Ikin, which are af- 

 foeiated with them, become in fome meafure torpid by reverfe 

 fympathy ; and a confequent chillnefs fucceeds with lefs abforp- 

 tion of atmofpheric moifture. See the fubfequent article. 



2. Pallor urintd pranforum. The palenefs of urine after a 

 full meal is an inftance of reverfe ailbciation ; where the fecond- 

 ary part of a train of ailociate motions atls with lefs energy in 

 ccniequence of the greater exertions of the primary part. Af- 

 ter dinner the abforbent veilels of the ftomach andinteftines are 

 ftimulated into greater aclion, and drink up the newly taken aU 

 iment ; while thofe, which are fpread in great number. on the 

 neck of the bladder, abforb lefs of the aqueous part of the urine 

 than ufual, which is therefore difcharged in a more dilute ftate \ 

 and has been termed crude by fome medical writers, but it only 

 indicates, that fo great a proportion of the fenforial power is ex- 

 pended on digeftion and a^bforption of the aliment, that other 

 parts of the fyftem acl for a time with lefs energy. See Clafs IV. 

 1. 1. 6. 



3. Pallor urbia a frigove cutaneo. There is a temporary dif- 

 charge of pale water, and a diarrhoea, induced by expofing the 

 fkin to the cold air \ as is experienced by boys, who ftrip them- 

 felves before bathing. In this cafe the mouths of the cutaneous 

 lymphatics become torpid by the fubduclion of their accuftom- 

 ed degree of heat, and thofe of the bladder and inteftines be- 

 come torpid by dire£l fympathy ; whence lefs of the thinner part 

 of the urinary fecretion, and of the mucus of the inteftines, is 

 reabforbed. See SecSt. XXIX. 4. 6. This effect of fuddenly 

 cooling the fkin by the afperfion of cold water has been ufed 

 •with fuccefs in coftivenef?; and has produced evacuations, when 



other 



