The
positive and the negative elements. How connected up. The battery.
Making wire. How electricity flows. Rate of flow. Volts and
amperes. Pressure and quantity. Drawing out the wire. Tools for
drawing the wire. Friction. Molecules and atoms. Accomplishments of
"Baby." Climbing trees and finding nuts. George as cook. Making
puddings. "Baby's" aid. Finding eggs of prairie chicken. Planning a
surprise for the Professor. The birthday party. George's cakes to
celebrate the event. Harry's gong. The missing cakes. "Baby" the
thief. The feast. Why laughter is infectious. Odors. Beautiful
perfumes wafted to long distances. Bad odors destroyed. Why. Oxygen
as a purifying agent.

XI. THE GRUESOME SKELETON

The Cataract water. Common oak chips as purifiers. Tannic acid.
Bitter almonds. Universal purification of water. The Bible method.
Albumen impurities in water. Electric battery. The electrode. How
the cells were made. Object of plurality of cells. Volts, amperes
and watts, and their definitions. A new boat determined on.
Determining size of the boat. Recovering their life-boat. Visit to
Observation Hill. Hunting for the lost flagpole and flag. Wreckage
of a ship's boat discovered. The Professor sent for. Ascertain it
is not part of their wrecked boat. Gathering up portions of the
boat. Amazing discovery of skull and skeleton. Methods of
determining age. Condition of the skull and teeth. Carrying the
remains to the Cataract. The funeral. The seven ages in the growth
of man. Sadness. The skeleton at the feast. Why is death necessary.
One of the many reasons.

XII. THE DISTANT SHIP AND ITS DISAPPEARANCE

The endive. Chicory. The principle in the plant. The root. Curious
manner of preparing it. A surprise for Harry. Making clay crocks.
How to glaze or vitrify them. The use of salt in the process. A
potter's wheel. Uses of the wheel. Its antiquity. Inspecting the
electric battery. How it is connected up. Peculiarities in
designating parts of the battery. Making the first spark. Necessary
requirements for making a lighting plant. The arc light. What arc
is and means. The incandescent light. Why the filament in bulb does
not readily burn out. Oxygen as a supporter of combustion. Carbon,
how made. Essential of the invention of the arc light. Determine