400 DISEASES CLASS IV. 2. 1. 1. 



too violent actions of the inflamed membranes of the loose tooth; 

 and then by a secondary sympathy the membranes about the 

 ear and temple became torpid, and painful; and those of the 

 alveolar process of the upper jaw regained their natural quantity 

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

 and attentive observations are wanted to elucidate these curious 

 circumstances of association, which will be found to be of the 

 greatest importance in the cure of many diseases, and lead us to 

 the knowledge of fever. 



SPECIES. 



1. Cutis frigida pransorum. Chilness after dinner frequently 

 attends weak people, or those who have been exhausted by exer- 

 cise; it arises from the great expenditure of the sensorial power 

 on the organs of digestion, which are stimulated into violent ac- 

 tion by the aliment; and the vessels of the skin, which are asso- 

 ciated with them, become in some measure torpid by reverse 

 sympathy; and a consequent chilness succeeds with less absorp- 

 tion of atmospheric moisture. See the subsequent article. 



2. Pallor urince pransorum. The paleness of urine after a 

 full meal is an instance of reverse association; where the second- 

 ary part of a train of associate motions acts with less energy in 

 consequence of the greater exertions of the primary part. After 

 dinner the absorbent vessels of the stomach and intestines are 

 stimulated into greater action, and drink up the newly taken ali- 

 ment; while those, which are spread in great number on the 

 neck of the bladder, absorb less of the aqueous part of the urine 

 than usual, which is therefore discharged in a more dilute state; 

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

 indicates, that so great a proportion of the sensorial power is ex- 

 pended on digestion and absorption of the aliment, that other 

 parts of the system act for a time with less energy. See Class 

 IV. 1. 1. 6. 



3. Pallor urinw afrigore cntaneo. There is a temporary dis- 

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

 skin to the cold air; as is experienced by boys, who strip them- 

 selves before bathing. In this case the mouths of the cutaneous 

 lymphatics become torpid by the subduction of their accustom- 

 ed degree of heat, and those of the bladder and intestines be- 

 come torpid by direct sympathy; whence less of the thinner part 

 of the urinary secretion, and of the mucus of the intestines, is 

 reabsorbed. * See Sect. XXIX. 4. 6. This eftect of suddenly 

 cooling the skin by the aspersion of cold water has been used 

 with success in costiveness, and has produced evacuations, when 



