above.

_The Magic Vessel._

On the bottom of a vessel, lay three pieces of money, the first at A,
the second at B, and the third at C, Fig. 3. Then place a person at D,
where he can see no farther into the vessel than E. You tell him, that
by pouring water in the vessel you will make him see three different
pieces of money; and bid him observe, that you do not convey any money
in with the water. But be careful that you pour the water in very
gently, or the pieces will move out of their places, and thereby
destroy the experiment.

[Illustration: Fig. 3.]

When the water rises up to F, the piece at A will be visible; when it
reaches G, both A and B will be visible; and when it comes up to H,
all three pieces will be visible.

_Artificial Earthquake and Volcano._

Grind an equal quantity of fresh iron filings with pure sulphur, till
the whole be reduced to a fine powder. Be careful not to let any wet
come near it. Then bury about thirty pounds of it a foot deep in the
earth, and in about six or eight hours the ground will heave and
swell, and shortly after send forth smoke and flames like a burning
mountain. If the earth is raised in a conical shape, it will be no bad
miniature resemblance of one of the burning mountains.

_Artificial Illuminations._

A very pleasing exhibition may be made with very little trouble or
expense, in the following manner: Provide a box, which you fit up with
architectural designs cut out on pasteboard; prick small holes in
those parts of the building where you wish the illuminations to
appear, observing, that in proportion to the perspective, the holes
are to be made smaller; and on the near objects the holes are to be
made larger. Behind these designs thus perforated, you fix a lamp or
candle, but in such a manner that the reflection of the light shall
only shine through the holes; then placing a light of just sufficient
brilliance to show the design of the buildings before it, and making a
hole for the sight at the front end of the box, you will have a very
tolerable representation of illuminated buildings.

The best way of throwing the light in front, is to place an oiled
paper before it, which will cast a mellow gleam over the scenery, and
not diminish the effect of the illumination. This can be very easily
planned, both not to obstruct the sight, nor be seen to disadvantage.
The lights behind the picture should be very strong; and if a
magnifying glass were placed in th