CHAPTER III.. Rain, Evaporation and Filtration.

RAIN, EVAPORATION AND FILTRATION.

Fertilizing Substances in Rain Water.--Amount of Rain Fall in United States; in England.--Tables of Rain Fall.--Number of Rainy Days, and Quantity of Rain each Month.--Snow, how Computed as Water.--Proportion of Rain Evaporated.--What Quantity of Water Dry Soil will Hold.--Dew Point.--How Evaporation Cools Bodies.--Artificial Heat Underground.--Tables of Filtration and Evaporation.