400 DISEASES CLASS IV. 2. 1. 1* 



too violent actions of the inflamed membranes of the loofe tooth 5 

 and then by a fecondary fympathy the membranes about the 

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

 alveolar procels of the upper jaw regained their natural quanti- 

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

 and attentive obfervations are wanted to elucidate thefe curious 

 circumftances of affociation, which will be found to be of the 

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

 the knowledge of fever. 



SPECIES. 



1. Cutis frigida pranforum. Chillnefs after dinner frequently 

 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 

 action by the aliment; and the veiTels of the fkin, which are af- 

 fociated 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 urina pranforum. The palenefs of urine after a 

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

 ary part of a train of aflbciate motions acts with lefs energy in 

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

 ter dinner theabforbent vefTels of the ftomach and interlines are 

 ftimulated into greater action, and drink up the newly taken al- 

 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 5 

 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 abforption of the aliment, that other 

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

 i. i. 6* 



3. Pallor urin* a f rigor e cutaneo. There is a temporary dif- 

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

 [kin to the cold air j as is experienced by boys, who ftrip them* 

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

 lymphatics become torpid by the fubduction of their accuftom- 

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

 come torpid by direct fympathy ; whence lefs of the thinner part 

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

 reabforbed. See Se&. XXIX. 4. 6. This effect of fuddenly 

 tooling the (kin by the afperfion of cold water has been ufed 

 with fuccefs in coftivencfs, and has produced evacuations, when 



other 



