402 DISEASES CtAss IV. 2. 1. 7 



digestion imperfectly, in consequence of their association with the 

 torpid motions of the vessels of the extremities. Fear, as it pro- 

 duces paleness and torpidity of the skin, frequently occasions tem- 

 porary indigestion in consequence of this association of the vessels 

 of the skin with those of the stomach; as riding in very bad roads 

 will give flatulency and indigestion to timorous people. 



A short exposure to cold air increases digestion, which is then 

 owing to the reverse sympathy between the capillary vessels of 

 the skin, and of the stomach. Hence when the body is exposed 

 to cold air, within certain limits of time and quantity, a reverse 

 sympathy of the stomach and the skin first occurs, and afterwards 

 a direct sympathy. In the former case the expenditure of sen- 

 sorial power by the skin being lessened, but not its production in 

 the brain; the second link of the association, viz. the stomach, 

 acquires a greater share of it. In the latter case, by the con- 

 tinuation of the deficient stimulus of heat, the torpor becomes ex- 

 tended to the brain itself, or to the trunks of the nerves; and 

 universal inactivity follows. 



7. Tussis a pedibus frigidis. On standing with the feet in 

 thawing snow, many people are liable to incessant coughing. 

 From the torpidity of the absorbent vessels of the lungs, in con- 

 sequence of their irritative associations with those of the skin, 

 they cease to absorb the saline part of the secreted mucus; and 

 a cough is thus induced by the irritation of this saline secretion; 

 which is similar to that from the nostrils in frosty weather, but 

 differs in respect to its immediate cause; the former being from 

 association with a distant part, and the latter from defect of the 

 stimulus of heat on the nostrils themselves. See Catarrhus fri- 

 gidus, Class I. 2. 3. 3. 



8. Tussis hepatica. The cough of inebriates, which attends 

 the enlargement of the liver, or a chronical inflammation of its 

 upper membrane, is supposed to be produced by the inconvenience 

 the diaphragm suffers from the compression or heat of the liver. 

 It differs however essentially from that attending hepatitis, from 

 its not being accompanied with fever. And is perhaps rather 

 owing to irritative association, or reverse sympathy, between the 

 lungs and the liver. As occurs in sheep, which are liable to a 

 perpetual dry cough, when the fluke-worm is preying on the sub- 

 stance of their livers. See Class II. 1. 1. 5. 



M. M. From half a grain to a grain of opium twice a day. A 

 drachm of mercurial ointment rubbed on the region of the liver 

 every night for eight or ten times. 



9. Tussis arthritica. Gout-cough. I have seen a cough, 

 which twice recurred at a few years distance in the same per- 

 son, during his fits of the gout, with such pertinacity and violence 



