Wheat soils, 29, 30.
water used by, 40.

Wheel hoes, 168.

White hellebore, 117.

Wind pollination, 132.

Work of roots, 9, 10, 15.

Work of sun in making soils, 32, 34.
air in making soils, 36.
animals in making soils, 37.
moving ice in making soils, 35.
moving water in making soils, 33, 35.
plants in making soils, 36.
rain in making soils, 33.

Wood ashes, 199.

Wool waste as fertilizer, 195.

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