Potato, sweet,
roots of, 13.
soils, 28, 160.

Properties of a fertile soil, 141.

Pruning, 137.


Quitch-grass, 121.
underground stem of, 121.


Radicle, 78.

Radish, shrunken root of, 10.

Ragweed, 5.

Rain, work of in making soils, 33.
on clay soils, 41.
on sandy soils, 41.

Rake, 101.

Rakes, 4.

Raking and soil water, 158.

Red spider, 117.