CHAPTER III.

Structure of Plants—Mode in which their Nourishment is obtained—Growth and Substance of Plants— Production of their Substance from the Food they imbibe—Mutual Transformations of Starch, Sugar, and Woody Fibre. 38

Of the Inorganic Constituents of Plants—Their immediate Source—Their Nature—Quantity of each in certain common Crops. 49

Of Soils—Their Organic and Inorganic Portions—Saline Matter in Soils—Examination and Classification of Soils—Diversities of Soils and Subsoils. 67