( -c>7 j

Whatsoevev may be done by means os theSun-Beams In the Day-time, thesome may be done with much more ease in rhe Nigbr, by the help os Tor-ches, Lamps, or orbor bright Lights, plac^d abouc the Objects, according tothe sovcral sorts os them.

t. There are every where made of theso Lamhorns to veprdent and mag- T h e Ma S ,c^i\ihe Figures upon a Wall, but then ’tis pnly in the Darii; wheresore to give Iwtborn im rvariety os Colours, take Oil of Spjke, and therein mix the scveral Colours, ^bScmth-wherewith you will have yoyr Gla(s to be stained, Paint them finely on , they well.’ n. 245.dry prelently, and penetrate any Glafs. f ■ ; 64 .

XXII. Having found by tmwy Trials, that forne Short-sighted Persons <4 -r-> *« Mpcould hnd little or no Relief, by the u(e of Concave Glasses, for Seeing Oh- ^’^Hookf’jects at any distance Distinct, and that any one may be made Short-sighted, pb. clll. n. 3 !and to be abje to distinguilh nothing but what is placcd very near his" Eye, t■ 5?«but within certain Limits of Distance, by putting on and looking through avery deep pajr pf Spectacles, such as Ancient Men uso : I concluded thatwhat Glafles shoyld make this Man.whilst looking thro’ theso Spectacles,to socthings at a greater Distance, would also help any other Person that should beShort'Sighted by Nature, I then considered, That by the help of a Convex .

Glafs, plaeed between the Object and the Eye, the Image of the Object maybe made to appear at any Distance front the Eye ; and consccjuently all Ob-jects may thereby be made to appear in any convenient Distance front theEye: so that the Short-Sigbted Eye Ihall contemplate the Picture of the Ob-ject, in the lanie mannet as if the Object it felf were in that place. Butthen becaufe the Picturos themfelves are so Inverted, and therefore will beuncouth to one, not used to soe them in that posture, I considered of tliefeExpedient« to help that Defect also.

First, If it be only for Reading of a Book, or Writing, therc needeth no-tbiflg but the Inversion of the Book, and then holding the Convex at a dueDistance, for the Picture of the Letters will appear Erected in the due Place,for the Eye to soe and distinguilh them very plainly.

Seeondjy, For soeing to Write, I thought this would be the best expedient,

That the Person Short-Sigbted Ihould first learn to Read with his naked Eye,

(both Printed Letters and also Written Hand) upside downwards, which hquickly attained to by one that can do both the right way.

Thirdly, For distinguilh ing Objects at a Distance, I can astert by my ownExperience, that wkh a httle Ufe of Contemplating Objects Inverted, one Ihallhave as good an Idea, and as true a Knowledge .ofoall mann er of Objects, as ifthey were soen Erected in ehek Natural Pofture.

XXIII. 1 . Eustttddo Divimhaüx made a Microfcope of a new Inventson, where- Mlc.osccpei ; b }in instead of an Eye Glafs Convex on both sides, obere are two Plano-Con- S.Divini. n.42.vex Glastes, which are so placed, as to touch one another !n the middle of*’’ 842 'their Convex Surface. It hath this peculiar, that it shews the Objects flat andn«t.crooked ; and although it takes in much, yet nemthelefi magnifieth ex-traordinarily.

Is-