Chapter I

Distinction between Organic and Inorganic
Substances.—The Ash of Plants.—Constitution
of the Organic Parts of Plants.—Preparation
and Properties of Carbon, Hydrogen, and
Nitrogen.—Meaning of Chemical Combination.

The object of the practical farmer is to raise from a given extent of land the largest quantity of the most valuable produce at the least cost, and with the least permanent injury to the soil. The sciences either of chemistry or geology throw light on every step he takes or ought to take, in order to effect this main object.