lt any Chemistry
text-book.) Make the gas and burn it at the end of a tube, holding a
dry, cold tumbler inverted over the flame. Note that water is formed.
Conclude what water consists of, namely, oxygen and hydrogen. Water may
be decomposed into oxygen and hydrogen, hence a use of hydrogen may be
shown by attaching a clay pipe to the generator and filling soap bubbles
with the gas. When freed these rise quickly.

MAGNETS

If bar magnets cannot be obtained, use a child's horse-shoe magnet.

Procure small pieces of cork, wood, iron, brass, glass, lead, etc., and
let pupils discover which the magnet attracts.

Have pupils interpose paper, wood, slate, glass, iron, lead, etc., in
sheets between the magnet and the iron and note the effect on the force
exerted.

Note that when one end of a magnet touches or comes near the end of a
nail, the nail becomes a magnet, but not a permanent one.

Magnetize a needle by drawing one of the poles of the magnet from end to
end of the needle, always in the same direction, about twenty times.
Suspend the needle horizontally with a piece of silk thread and note its
position when at rest.

Get a small compass and show how it is related to the foregoing
experiments. Emphasize its use to mariners. If possible, get a piece of
lodestone and show its magnetic properties.

ELECTRICITY

Half fill a tumbler with water and add about a teaspoonful of sulphuric
acid. Set in this a piece of copper and a piece of zinc, but do not let
them touch. Make a coil by winding insulated wire around a block of wood
about ten times. Remove the wood and place a compass in the centre of
the coil. Join the ends of the wire to the two metals in the tumbler.
The sudden movement of the needle will be taken as the indication of a
current.

Let pupils try experiments with many pairs of solids, such as lead and
silver, carbon and glass, wood and iron, tin and zinc, and liquids such
as vinegar and brine.

Show pupils how to make a simple battery. See home-made apparatus, page
50, and consult _Laboratory Exercises_ by Newman. Two or three dry cells
will be found sufficient for any experiments, but the home-made battery
is to be preferred.

Show pupils how to make a magnet by winding a piece of insulated wire
around a nail and joining the ends of the wire to the battery. Make a
horse-shoe magnet by bending the nail and winding the wire about both
ends in opposite directions.

As an application of the electro-