126 DISEASES Class I. 2. 5. 4. 



And that on the fame account their rooms fbould he kept filent 

 as well as dark •, that they mould be at reft in a horizontal pof- 

 ture ; and be cooled by a bia(t of cool air, or by warning them 

 with cold water, whenever their fkins are warmer than natural. 



4. Strabifmus. Squinting is generally owing to one eye be- 

 ing lefs perfect than the other ; on which account the patient 

 endeavours to hide the word eye in the fhadow of the note, that 

 his vifion by the ether mny not be confufed. Calves which 

 have an hydatide with infects inclofed in it in the frontal finus 

 on one fide, turn towards the affected fide j becaufe the vifion 

 ori that fide, by the prefTure of the hydatide,. becomes lefs per- 

 fect •, and the difeafe being recent, the animal turns round, ex- 

 pecting to get a more diftincr. view of objects. 



In the hydrocephalus in tenuis, where both eyes are not be- 

 come infenfible, the patient fquints with only one eye, and views 

 objects with the other, as in common ftrabifmus. In this cafe 

 it may be known on which fide the difeafe exiits, and that it 

 does not exift on both fides of the brain ; in fuch circumftances, 

 as the patients I believe never recover as they are now treated, 

 might it not be advifeable to perforate the cranium over the ven- 

 tricule of the affected fide ? which might at ieail give room and 

 itimulusto the affected part of the brain ? 



M. M. If the fquinting has not been confirmed by long habit, 

 and one eye be not much worfe than the other, a piece of 

 gauze ftretched on a circle of whale-bone, to cover the belt, eye 

 in fuch a manner as to reduce the diftinc-tnefs of vifion of this 

 eye to a fimilar degree of imperfection with the other, mould be 

 worn fome hours every day. Or the better eye iliould be total- 

 ly darkened by a tin cup covered with black filk for fome hours 

 daily, by which means the better eye will be gradually weak- 

 ened by the want of ufe, and the worfe eye will be gradually 

 ftrengthened by ufing it. Covering an inflamed eye in chil- 

 dren for weeks together, is very liable to produce fquinting, for 

 the fame reafon. 



5. Amaurcfis. Gntta ferena. Is a blindnefs from the inirritabil- 

 ity of the optic nerve. It is generally efteemed a palfy of the nerve, 

 but mould rather be deemed the death of it, as paralyfis has gener- 

 ally been applied to a deprivation only of voluntary power. I his 

 is a difeafe of dark eyes only, as the cataratl is a difeafe of light 

 eyes only. At the commencement of this difeafe, very minute 

 electric (hocks mould be repeatedly paffed through the eyes ; fuch 

 as may be produced by putting one edge of a piece of filverthe 

 fize of a half crown piece beneath the tongue, and one edge of a 

 piece of zinc of a fimilar fize between the upper lip and the gum, 



and 



