4 o8 DISEASES CLASS IV. 2. i. 13, 



as any degree of vertigo is produced, it is a proof, that by the 

 too great expenditure of fenforial power by the ftomach, and its 

 neareft afibciated motions, the morediftant ones, as thofe ofvif- 

 km, become imperfectly exerted. From hence may be deduc- 

 ed the necefTny of exhibiting wine in fevers with v/eak pulfe 

 in only appropriated Quantity ; becaufe if the leaft intoxication 

 be induced, fome part of the iyftem muft act more feebly from 

 the unnecefTary expenditure of fenforial power. 



13. Vertigo febriculofa. Vertigo in fevers either proceeds 

 from the general deficiency of fenforial power belonging to the 

 irritative aflbciations, or to a greater expenditure of it on fome 

 links of the trams and tribes of afTociated irritative motions. 

 There is however a (lighter vertigo attending all people, who 

 have been long confined in bed, on their firft riling ; owing to 

 their having been fo long unufed to the apparent motions of ob- 

 jects in their erect pofture, or as they pafs by them, that they 

 have loft in part the habit of balancing themfelves by them. 



14. Vertigo cerebrcfa. Vertigo from injuries of the brain, 

 either from external violence or which attend paralytic attacks, 

 are owing to the general deficiency of fenforial power. In 

 thefe dirtrefsful fituations the vital motions, or thofe immediate- 

 ly neceffary to life, claim their fhare of fenforial power in the 

 iirfl place, otherwife the patient mull die 5 and thofe motions, 

 which are lefs neceflary, feel a deficiency of it, as thefe of the 

 organs of fenfe and mufcles ; which conftitute vertigo ; and laft- 

 ly the voluntary motions, which are (lill lefs immediately necef- 

 fary to life, are frequently partially deftroyed, as in palfy j or 

 totally, a$ in apoplexy. 



15. Murmur aurium vertiginofum. The vertiginous murmur 

 in the ears, or noife in the head, is compared to the undulations 

 of the found of bells, or to the humming of bees. It frequent- 

 ly attends people about 60 years of age , and like the vifual ver- 

 tigo defcribed above is owing to our hearing lefs perfectly from 

 the gradual inirritability of the organ on the approach of age ; 

 and the difagreeable fenfation of noife attending it is owing to 

 the lefs energetic action of thefe irritative motions ; which not 

 being fufficiently diftinct to excite their ufual aflbciations become 

 fucceeded by our attention, like the indiftinct view of the ap- 

 parent motions of objects mentioned in vertigo vifualis. This 

 may be better und>* flood from confidering the ufe, which 

 blind men make of thefe irritative founds, which they have 

 taught themfelves to attend to, but which efcape the notice of 

 others. The late blind Juftice Fielding walked for the firft 

 time into my room, when he once vifited me, and after fpeak- 

 )ng a few words faid, " This room is about 22 feet long, 18 



wide, 



