ht or nine inches in diameter. Provide also
a common dish, sufficiently large to allow the bell-glass to stand well
within its raised border. Then procure two little wax candles, three or
four inches in length, and stand each in a little bottle or other
temporary candlestick. Place them in the center of the dish and light
the wicks. Then pour water into the dish to the depth of nearly an inch,
and finish by placing the bell over the candles, which of course are
then closely shut in. For a few minutes all goes on properly. The flames
burn steadily, and seem to laugh at the idea of their being about to
die. But, presently, they become faint,--first one, then the other; the
luster and the size of the flames diminish rapidly, and then they go
out. This is because the burning candles consumed all the oxygen that
was contained within the volume of atmosphere that was in the bell, and
were unable, on account of the water, to get new supplies from outside.
It illustrates, in the most perfect manner, our own need of constant
supplies of good fresh air. The experiment may be improved, or at all
events varied, by using candles of different lengths.

ROSE-COLOR PRODUCED FROM GREEN.

Obtain a small quantity of roseine,--one of the wonderful products
obtained from gas-tar, and employed extensively in producing what are
called by manufacturers the "magenta colors." Roseine exists in the
shape of minute crystals, resembling those of sugar. They are hard and
dry, and of the most brilliant emerald green. Drop five or six of these
little crystals into a large glass of limpid water. They will dissolve;
but instead of giving a _green_ solution, the product is an exquisite
crimson-rose color, the color seeming to trickle from the surface of the
water downward. When the solution has proceeded for a short time, stir
the water with a glass rod, and the uncolored portion of it will become
carmine.

SOME ELECTRICAL EXPERIMENTS.

Take a piece of common brown paper, about a foot in length, and half as
wide. Hold it before the fire till it becomes quite hot. Then draw it
briskly under your left arm several times, so as to rub it on both
surfaces against the woolen cloth of your coat. It will now have become
so powerfully electrified, that if placed against the papered wall of
the parlor, it will hold on for some time, supported, as it were, by
nothing.

While the piece of brown paper is thus so strangely clinging to the
wall, place a small