igB DISORDERED EYES. 



In.M. Campe's cafe, too, what he complains of might 

 be owing to the quality of the glafTes of the fpe&acles, 

 1 never took my glafTes out of fpectacles, as thefe arc 

 commonly ground, and I would not habituate my eyes, 

 which were naturally good, too early to them. Ordi- 

 nary clear glafs ferves my purpofe as well. This cover- 

 ing, however, was Hill attended with two inconveni- 

 encies ; the one, that from the breath the glafTes would 

 grow dim in the cold, and this vapour congealing, the 

 glafTes would require frequent wiping ; the other, that 

 t>oth fun and fnow alike offended my eyes. Neceffity 

 is the grand inventrefs, or turns to ufe what is already 

 found out. This I have more than once experienced 

 during my tedious indifpofltion in the eyes. After 

 Laving long confidered in vain, how I might remedy 

 thefe two defecls, I little thought of meeting with In* 

 itruclions for that purpofe in profefTor Pallas's travels. 

 But there it was, if I mi flake not, that I found a re- 

 medy for both. In the defarts of Siberia it is ufual 

 with the inhabitants, for defending their eyes againft 

 the dazzling fnow, to employ a thin piece of ivory 

 with a flit cut acrofs it, through which is admitted a 

 moderate degree of light, jufl: lo much as is requifite 

 for feeing their way in travelling over a defart of fnow, 

 A couple of fuch ivory counters anfwered my purpofe 

 completely at once. They did not get fulfilled with 

 moifture, they fufneiently kept off the wind, as the flit 

 is narrow, and neither fun nor fnow can dazzle the eye 

 fo much as through glafs, I muft flill add this caution 

 for them, whofe eyes, from weaknefs, are apt to grow 

 wet by the glare of the fun, of candles, or of mow,, 

 that they dry them,, not with a filk, but with a linen 



handkerchief. 



