n, without Injury to the Eye._

Take a burning-glass, or spectacle-glass, that magnifies very much;
hold it before a book or pasteboard, twice the distance of its focus,
and you will see the round body of the sun, and the manner in which
the moon passes between the glass and the sun, during the whole
eclipse.

_The Burnt Writing restored._

Cover the outside of a small memorandum book with black paper, and in
one of its inside covers make a flap, to open secretly, and observe
there must be nothing over the flap but the black paper that covers
the book.

Mix soot with black or brown soap, with which rub the side of the
black paper next the flap; then wipe it clean, that a white paper
pressed against it will not receive any mark.

Provide a black-lead pencil that will not mark without pressing hard
on the paper. Have likewise a small box, about the size of a
memorandum book, and that opens on both sides, but on one of them by a
private method. Give a person a pencil and a slip of thin paper, on
which he is to write what he thinks proper; you present him the
memorandum book at the same time, that he may not write on the bare
paper. You tell him to keep what he writes to himself, and direct him
to burn it on the iron plate laid on a chafing-dish of coals, and give
you the ashes. You then go into another room to fetch your magic box,
before described, and take with you the memorandum book.

Having previously placed a paper under the flap in the cover of the
book, when he presses hard with the pencil, to write on his paper,
every stroke, by means of the stuff rubbed on the black paper, will
appear on that under the flap. You therefore take it out, and put it
into one side of the box.

You then return to the other room, and taking a slip of black paper,
you put it into the other side of the box, strewing the ashes of the
burnt paper over it. Then shaking the box for a few moments, and at
the same time turning it dexterously over, you open the other side,
and show the person the paper you first put in, the writing on which
he will readily acknowledge to be his.

If there be a press or cupboard that communicates with the next room,
you need only put the book in the press, and your assistant will open
it, and put the paper in the box, which you presently after take out,
and perform the rest of the amusement as before.

There may likewise be a flap on the other cover of the book; and you
may rub the paper against tha