Section I. Classification of soils; Section II. Adaptation to different
fruits-Varieties of the apple, apricot, berberry, cherry, currant, fig,
- Varieties of the pear,
gooseberry, grape, peach, and nectarine
Change in the vegetable world - Effect of climate, soil, and position -
Cultivation, degeneracy, or deterioration-Decrepitude - Methods
of production Selection-Van Mon's theory as distinguished from
it Cultivated fruits not descended from their mild types—Impor-
tance of securing seed from a young tree
iments of Kolreuter, Herbert, Knight, Gærtner, Lindley, Purkinje,
Mirbel, Adolphe Brogniart, Conrad Sprengel, Cassini, Alphonse de
Candolle, Schleiden, Fritsche, Thwaites, Mr. Rogers-Manner of
operation
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