Of strange Cjlafses»

placed,that it may fire the fuel ca i in : the next day, at the hcur appointed, lecthsplain Glass cast in the beams upon the Concave-glas: ,that will unite them : so with-out danger, or any suspicion of the enemy, we may kindle fire for our use. Nor is ituseless.

That Its a slain and. Q'oncave-Glass the smallest letters stall appear very great,

when letters are so small that they can onely be seen: For I have seen St. Johns Go-spel, In the beginning, &c. writ so small, in so little place, that it was no bigger thana small pimple, or the fight in a Cocks eye. By this Artifice we may make themseem greater, andreadthem with ease. PutaConcave-glais, with the back of it toyourbrest; over against it in the point of burning, set the writing; behind setaplain Glass, that you may fee it: Then in the plain Glass will the Images of the Cha-racters be reflected , that are in the Concave-glass, which the Concave-Glass bathmade greater, that you may read them without difficulty. You may

Wtth A flam and Cone ave-Glass, make an-Image be seen hanging altogether in the Atr.Do thus. Isaidtbat by helpof aConcave-Glals, an Image may be sent forth: andthis is seen by none but those that stand over against it; Set the Ccncave-Glafs toyour brest , without the Centre place a Poniard against it, and going farther off, seta plain Glass against it; and looking in that, you shall fee the Image reflected fromthe Concave-glass, hanging in the Air, and that exactly. But if an ingenious manobserve it, he may wonderfully see an Image hanging in the Air, that is received ina plain Glass, and sent far out as I (hewed, without the help of a Conctvc-gliss, anda visible spectacle, by the means of a plain Glass onely. You may also

By a plAin Glass fee yomface turned the wrong way.

When you have set the Glass to your brest, as I said; set a plain Glass against it, andlook upon it, it will cast it upon the Concave-glass, and that will beat it backwardson the plain Glass: so have you your purpose.

Chap. VI.

Other operations of a (foncave-Glass.

B Esorel part from the operations of this Glass, I will tell you some use of it, thatis very pleasant and admirable, whence great secrets of Nature may appear untous. As,

To fee all things in the dark ,, that are outwardly done in the Sun,with the colours of them.

You must shut all the Chamber windows, and it will do well to shut up all boles be-sides, left any light breaking in should spoil all. Onely make one hole, that shall bea hands breadth and length; above this fit a little leaden or brass Table, andglewit, so thick as a paper • open a round hole in the middle of it, as great as your littlefinger: over against this, let there be white walls of paper, or white clothes, so shallyou see all that is done without, in the Sun, and those that walk in the streets, like toAntipodes, and what is right will be the left, and all things changed - and the far-ther they arc off from the hole, the greater they will appear. If you bring your pa-per, or white Table neerer,they will shew less and clearer • but you must stay awhile,for the Images will not be seen presently: because a strong similitude doth some-times make a great sensation with the fence , and brings in such an affection, that notonely when the senses do act, are they in the organs, and do trouble them, but whenthey have done acting, they will stay long in them: which may easily be perceived.For when men walk in the Sun , if they come into the dark, that affection continues,that we can sec nothing, or very fcantly; because the affection made by the light, isstill in our eyes; and when that is gone by degrees, we see clearly in dark places.Now will I declare what I ever concealed till now, and thought to conceal continu-ally. If you put a small ccmicular Crystal glass to the hole, you (hall presently fee

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