icroscope and other scientific appliances the
discovery was soon made that decay in teeth is produced by a minute worm
resulting from the absence of the proper electricity, necessary for
preserving in the tooth a healthy action. When this electricity is
deficient, the circulation in the bone becomes sluggish, the fatty
matters stagnate, and through the warmth of the gum acting on the
stagnant accumulation, a single worm is generated.

Though we had discovered the existence of the worm and the cause of its
being bred, some time elapsed before we were able to discover whether
the necessary electricity was wanting, and, by supplying the deficiency,
to prevent the generation of the worm. At length a professor, by name
Jerronska, invented an ingenious little instrument, of a form
corresponding to the upper and lower jaw, and furnished above and below
with small points or minute spikes; the instrument in a contracted shape
is introduced into the mouth and is there expanded to correspond to the
form of the jaws. It is charged with an electricity that can escape
through the spikes only, and is opposed to the electricity of the teeth,
which if healthy will cause a slight shock to the patient, without any
other inconvenience. On the other hand, if any of the teeth do not
contain the proper kind or quantity of electricity, they will turn to a
colour like fire, leaving the healthy teeth untouched; for the
instrument affects those teeth alone whose electricity is defective.

We have then the means of impregnating the unhealthy teeth with the
proper electricity, and thus destroying the incipient ovum, which cannot
live in an electricity healthful to the tooth.

In like manner, minute precautions are taken to preserve the beauty and
power of the eye. Formerly, in consequence of the intensity of light in
Montalluyah, and through other causes, the sight suffered severely.

Our physicians also found out the means of tracing and removing the
germs of defects in the ear, the nostrils, the tongue--in short,
everything that, if neglected, might impair the adult's energies and
beauty.

Great attention is paid to the quality of the air in which children are
bred, for air affects both the blood and the nerves. Its effect on the
blood was long known, through the fact that air is one of its important
ingredients; but its effect on the nerves was first demonstrated by
observing that nerves taken from a person recently dead shrivel and
contr