Heat and the farmer, 5.

Heat necessary for germination, 73.

Hilling the crop, 169.

Hilum, 77.

Hoeing and soil water, 158.

Hoes, 4.

Horn shavings as fertilizer, 195.

Horse manure, 176.
losses when piled, 176.

House plants, watering of, 51.

How the bean gets up, 78.

How the corn gets up, 79.

Humus, 27, 38.
influence on soil texture, 62.
nitrogen in, 67.
a source of nitrogen, 67.
water-absorbing power of, 41.
water-holding power of, 44.
water-pumping power of, 43.