reatment we need most
beneficially from our food. Our physicians are most serious and
thoughtful men. They never claim to be infallible, but study
scientifically to increase their knowledge and improve the methods of
treatment. As a result of this, fresh air, regular exercise for both
sexes, with better conditions, and the preservation of the lives of
children that formerly died by thousands from preventable causes, the
physique, especially of women, is wonderfully improved, and the average
longevity is already over sixty.

"Our social structure, to be brief, is based on science, or the
conservation of energy, as the Greek philosophers predicted. It was
known to them that a certain amount of power would produce only a
certain amount of work--that is, the weight of a clock in descending or
a spring in uncoiling returns theoretically the amount of work expended
in raising or coiling it, and in no possible way can it do more. In
practice, on account of friction, etc., we know it does less. This
law, being invariable, of course limits us, as it did Archimedes and
Pythagoras; we have simply utilized sources of power that their clumsy
workmen allowed to escape. Of the four principal sources--food, fuel,
wind, and tide--including harnessed waterfalls, the last two do by far
the most work. Much of the electrical energy in every thunderstorm is
also captured and condensed in our capacious storage batteries, as
natural hygeia in the form of rain was and is still caught in our
country cisterns. Every exposed place is crowned by a cluster of huge
windmills that lift water to some pond or reservoir placed as high as
possible. Every stiff breeze, therefore, raises millions of tons of
water which operate hydraulic turbines as required. Incidentally
these storage reservoirs, by increasing the surface exposed to
evaporation and the consequent rainfall, have a very beneficial effect
on the dry regions in the interior of the continent, and in some cases
have almost superseded irrigation. The windmill and dynamo thus
utilize bleak mountain-tops that, till their discovery, seemed to be
but indifferent successes in Dame Nature's domain. The electricity
generated by these, in connection with that obtained by waterfalls,
tidal dynamos, thunderstorms, chemical action, and slow-moving
quadruple-expansion steam engines, provides the power required to run
our electric ships and water-spiders, railways, and stationary and
portable mo