Z5L Natural Maqick. Doo/^ u5.

strong fire; pat such things to ir, as will hasten the melting of ic: when it is melted,cast it into some hollow place,pownd it in a brais Mortar,for it will be easily do&csdoit so three or four times; then powder it, and mingle quj^k-silver with it, and let itboil in a glazed vessel six hours, till it be well mingled; then press the seal upon it,and let it cool, and it will become exceeding hard. It is possible

Te make a great Seal less ,

Vic should happen that we want a lesser seal, we trust do thus: Take Isinglass, anddissolve it in water ; anoynt the figure with oyl, that it may not stick to the glew;compass the seal about with wax, that the matter run not about; put the Isinglass tothe fire, and melt it, pour it upon the seal; after three hours, when it is cold, take itaway, and let it dry, for the seal when it!s dry, will be drawn less equally. Isyouwill

Imitate the fo~m of a writing,

do thus s Open the letter upon a looking-glass, that wants the foyl: upon the letterlay white paper, and a light under the glass; temper your ink as the writing is, anddraw your lines upon the lines of the letters you fee through. We may

Open letters , and (hut them without fufpittox.

We use to seal letters, putting paper upon them, which goes through the letter onone side, and wax is put on the other side, where it comes forth, and there it is seal-ed. You shall open the letter thus : Break away that part of the paper, that is putupon the place, where it paffeth through the letter, and the hole is, the letter opfcnspresently: read it, and shut it again, and put the paper torn off, in its proper place:first, anoynting the crack with gum-traganth, d'ssdvcd in water; for the paper will beso glewed,that U will be stronger there then elsewhere ; press it with a (mail weight,till it grow dry; the fraud cannot be discovered,because the glew is white, and is notknown from the colour of the paper.

Chap. XII. - A

How you may fpsak_at a great distance.

\

T Here are many ways how we may speak at a very great distance, with our friendsthat are absent,or when they are in prison, or shut up in Cities; and this is donewith safety, and without any suspicion, as I shall shew. Two things are declaredhere,either to do it by open voice reduplicated,or else by a Trunk, We may

fVith open vojee jhew some things to those that are confederate with us.

It is wonderful, that as the Light, so the Voyce is reverberated with equal Angles.

I shall shew how this may be done by a glass. It is almost grown common, how tospeak through right or circular walls. The voice passing from the mouth goes throughthe Air s if it goes a&out a wall that is uniform, it passeth uncorrupted but if it be atliberty, it is beaten back by the wall it meets with in the way, and is heard, as wefee in an Eccho. I through a circular building, that was very long and smooth, spakewords to my friend, that heard them round the wall, and the words came entire tohis ears; but one standing in the middle heard not any noise, and yet I heard againwhat my friend answered to me. In the morning whenas I walked by the sea (bore,

I heard above a mile, what my friends tjslked in a Boat: the sea was very calm, andscarce moved , and the words came clearly to me, carried on the plain superficies of

the water. I hear that at Mantua, and other places, a great Gallery is built, where*in one speaking in the corner, is heard by another that knows the business , standingin another corner ; but those that stand in the middle, perceive nothing of it. ® utmore exactly and clearly

To fignise to friends all things by a Trunks

Let