_The Pressure of Water._

The pressure of water may be known to every one who will only take the
trouble to look at the cock of a water-butt when turned: if the tub or
cistern be full, the water runs with much greater velocity through
the cock, and a vessel will be filled from it in a shorter time than
when it is only half-full, although the cock, in both cases, is
equally replete with the fluid during the time the vessel is filling.
From this also is understood, how a hole or leak, near the keel of a
ship, admits the water much quicker, and with greater violence, than
one of the same size near what the mariners call the water's edge.

_Refraction of Light._

In the middle of an empty basin put a piece of money, and then retire
from it till the edge of the basin hides the piece from your sight:
then keep your head steady, let another person fill the basin gently
with water; as the water rises in the basin the money will come in
view; and when of a sufficient height in the basin, the whole of the
piece will be in sight.

_Wonderful Nature of Lightning._

If two persons, standing in a room, looking different ways, and a loud
clap of thunder, accompanied with zigzag lightning, happen, they will
both distinctly see the flash at the same time; not only the
illumination, but the very form of the lightning itself, and every
angle it makes in its course will be as distinctly perceptible, as
though they had both looked directly at the cloud from whence it
proceeded. If a person happened at that time to be looking on a book,
or other object, which he held in his hand, he would distinctly see
the form of the lightning between him and the object at which he
looked. This property seems peculiar to lightning, as it does not
apply to any other kind of fire whatever.

_To show that the White of Eggs contains an Alkali._

Add to a wine-glass half full of tincture of red cabbage a small
quantity of the white of an egg, either in a liquid state or rendered
concrete by boiling. The tincture will lose its blue colour and become
changed to green, because the white of the egg contains soda.

_Two Inodorous Bodies become very Pungent and Odorous by Mixture._

When equal parts of muriate of ammonia and unslaked lime, both
substances destitute of odour, are intimately blended together in a
mortar, a very pungent gas (ammonia) becomes evolved.

_Interesting Experiment for the Microscope._

The embryo grain of wheat, at t