CLASS I. 2. 5. 6. OF IRRITATION. 1 27 



and then repeatedly bringing their exterior edges into contact, 

 by which means very fmall eleftric fparks become vifible in the 

 eyes. 



Mrs. T had for fome weeks complained of imperfect 



fight. For the laft fortnight lhe could not in lefs than a minute 

 fpell out a fingle word in a large print. Her eyes black, and the 

 pupils large. Very flight electric (hocks, not fparks, were pafled 

 through the forepart of her forehead twice a day, and the zinc 

 and filver pencils as mentioned below were ufed many times a 

 day. iShe took valerian and columbo internally, and regained her 

 fight very perfectly in about three weeks. 



I ufed in the above cafe a more convenient and efficacious 

 method of galvanifm by employing two rods, one of them of zinc 

 about the fize of a writing pencil, and the other a filver pencil- 

 cafe about the fame (ize ; and by putting the end of the zinc 

 rod in contact with the external corner of one eye, and the end 

 of the filver pencil-cafe in contacl; with the external corner of the 

 other eye, and then repeatedly making the other ends touch each 

 other ; fparks will be vifible in the eyes both at the time of con- 

 tacl: and at the time of feparation of the two rods. This experi- 

 ment was publifhed by Volta fince the former one by Galvani. 

 See Sea. XIV. 5. of Vol. I. 



A foreign phyfician, proferTor Arnemann, has lately recom- 

 mended the production of vertigo in gutta ferena, as he fays, to 

 accumulate more blood in the head. If this mould be really 

 found of advantage the patient might lie on a large mill-done,, 

 which might be fuffered to turn flowly, but a very great velocity 

 of the whirling ftone might occafion ileep, apoplexy, and death. 

 See Supl. I. 15. 7. 



M. M. Minute electric mocks. A grain of opium, and a 

 quarter of a grain of corrofive fublimate of mercury, twice a day 

 for four or fix weeks. Blifter on the crown of the head. Er- 

 rhines, fo as to induce violent fneezing. twice a day for a week. 



6. Audltus itnmiiiutus. Diminifhed hearing. Deafnefs is a 

 frequent fymptom in thofe inflammatory or fenfitive fevers with 

 debility, which are generally called putrid ; it attends the general 

 ftupor in thofe fevers, and is rather efteemed a falutary fign, as 

 during this ftupor there is lefs expenditure of fenforial power. 



In fevers of debility without inflammation, called nervous fe- 

 vers, I fufpecl: cleafnefs to be a bad fymptom, arifing, like the di- 

 lated pupil, from a partial paralyfis of the nerve of fenfe. Sec 

 ClnfslV.2. i. 15. ' 



Nervous fevers are fuppofed by Dr. Gilchrift to originate from 

 a congeftion of ferum or water in feme part of the brain, as many 

 of the fymptoms are fo fimilar to thofe of hydrocephalus inter- 



