Because the funnel, by passing through the roof into the outer air,
operates as a very powerful ventilator, the heat and smoke passing off
with a large proportion of the air of the house.

The ventilation of rooms and buildings can only be perfectly effected,
by suffering the heated and foul air to pass off through apertures in
the ceiling, while fresh air, of any desired temperature, is admitted
from below.--Brande.

Why do heated sea-sand and soda form glass?

Because, by heating the mixture, the cohesion of the particles of each
substance to those of its own kind is so diminished, that the mutual
attractions of the two substances come into play, melt together, and
unite chemically into the beautiful compound called glass.

Why is sand used in glass?

Because it serves for stone; it being said, that all white transparent
stones which will not burn to lime are fit to make glass.


Electricity.

Why is an arrangement of several Leyden jars called an electrical
battery?

Because by a communication existing between all their interior coatings,
their exterior being also united, they may be charged and discharged as
one jar.