XIII. Improving the Chemical Nature of the Soil XIV. Productiveness of Soils XV. Rotation of Crops XVI. Relations of Plants above Ground XVII. The Office of Flowers XVIII. Pruning and Training of Plants XIX. Propagation of Plants XX. Improving Plants and Seeds XXI. Fungus Diseases of Plants XXII. Insects of the Farm XXIII. Some Special Injurious Insects XXIV. Useful Insects XXV. Wild Birds and Other Insect-eating Animals (viii)

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