Mi fcellanea Cur to fa. 1 2 «J 



And thefe Spe&acles may be fuppos'd better 

 for preferring the Sight, than the ordinary ones 

 with Giaffes, becaufe they reprefent the Object 

 more naturally, and withal more clearly and di- 

 ftinctly to the Eye, than the other, whole refract- 

 ed Rays being collected together with the right 

 ones in the Glafles, do fbmewhat confound good 

 Vifion, as before : Efpecially if the vifive Power 

 be ftrong enough to be fuSiciently determin'd by 

 the right Rays alone. 



For I fpeak now of prefer ving a good Eye 

 by thefe Spectacles, which holds in proportion 

 true aifo of a bad one. Becaufe thofe Rays 

 (both right and refracted) being collected and 

 brought fb near the Eye (whether good or bad) 

 as the Spectacles are ulually plac'd, do too much 

 affect it, both by their own brightnefs, and alfo 

 by the brightnefs of the Colours of the Object 

 (when they are bright) which is brought very 

 near alfb ; whereby the Eye is dazl'd and con- 

 founded, unlefs there be a ftrong attention and 

 conatus of the Spirits, .whereto the bright Rays 

 do certainly engage them, which of neceility 

 weakens Vifion, efpecially if thefe Glafs-fpecta- 

 cles be much us'd. 



Wherefore the now defcrib'd new Tube-fpecta- 

 cles, contributing io much to the help and pre- 

 fervation of Sight, may well be counted an im- 

 provement of DireH Vifion, becaufe they convey 

 the Rays to the Eye without any kind of Refracti- 

 on whatsoever. Seeing the fame Object alio 

 through various holes, plac'd at certain diftances, 

 does fomewhat alter Virion ; but of this perhaps 

 more hereafter. 



Now as DirsB Vifion has thus been impro- 

 ved, fb likewife Dirett Hearing partly has al- 

 ready received, and partly may (by the Doctrine 



whereof 



