Chapter X.--the Thundershower.

A thundershower is always a phenomenon of interest and often of fear on the part of children. The clouds of the cumulus form, the rolling of thunder, the lightning flashes, the rushing wind, and the pouring rain are full of important lessons. Fear vanishes as knowledge comes. In the thundershower is the question of the distribution of moisture over the earth's surface, the question of the nature and use of clouds, the movement of the air and wind, the condensation of vapor, and the marvelous powers of electricity.