Spike-toothed harrows, 102, 104.

Spraying, 118.

Spring plowing, 98.

Spring-toothed harrows, 102, 103.

Squash flowers, 133.

Stable manure, 171, 173.

Stamen, 129.
function of, 131.

Staminate flowers, 133.

Starch in plants, 64, 66.
iodine test for, 64.

Stems, 8, 120.
distinguished from roots, 120.
habit of growth of, 121.
structure of, 125.
underground, 121.
uses of, 120.
work of checked, 126.

Stigma, 130.