59. In communities where gas is not available, kerosene, which is
produced by the refinement of petroleum, is used extensively as a fuel
for cooking, especially in hot weather when the use of a coal or a wood
stove adds materially to the discomfort of the person who does the
cooking. Kerosene is burned in stoves especially designed for its use,
and while it is a cheap fuel it is not always the same in quality. It
contains water at all times, but sometimes the proportion of water is
greater than at others. The greater the amount of water, the less fuel
will be contained in each gallon of kerosene. The quality of kerosene
can be determined by checking up the length of time the stove will burn
on a specified quantity of each new purchase of it.

Another product of the refinement of petroleum is _gasoline_. However,
it is not used so extensively for fuel as kerosene, because it is more
dangerous and more expensive.


ELECTRICITY

60. The use of electricity for supplying heat for cooking is very
popular in some homes, especially those which are properly wired,
because of its convenience and cleanliness and the fact that the heat it
produces can be applied direct. The first electrical cooking apparatus
was introduced at the time of the World's Fair in Chicago, in 1892, and
since that time rapid advancement has been made in the production of
suitable apparatus for cooking electrically. Electricity would
undoubtedly be in more general use today if it were possible to store it
in the same way as artificial gas, but as yet no such method has been
devised and its cost is therefore greater. Electricity is generated in