The hot air from a lamp or gas jet will also impart activity to this mimic reptile.
—————◀▶—————
THE DIVIDED SQUARE PUZZLE.
Take a square of paper or cardboard, and cut it into four pieces, as shown in the engraving. Now try to put them back in the form of a square. This seemingly simple puzzle, has kept our young people busy a whole evening, and was only accomplished at last by marking each piece before it was cut apart.
—————◀▶—————
EXPERIMENT WITH TWO PIECES OF GLASS.
Procure two pieces of glass about six inches square, join any two of their sides, and separate the opposite sides with a piece of wax, so that their surfaces may be at a slight angle; immerse this apparatus about an inch in a basin of water, and the water will rise between the plates and form a beautiful geometrical figure called a hyperbola.
—————◀▶—————