Ammonia in fertilizers, 204, 205.
in barn manures, 175.
lost by fermentation, 175.
sulphate of, 194.

Analysis of plants, 163-166.
of fertilizers, 203.

Animals, 5.
and the farmer, 5.
dependent on plants, 6.
work of, in making soils, 37.

Annual plants, 125.

Anthers, 129.

Aphis, 116.

Apple, flower of, 129, 130.

Ash in plants, 65, 66.

Ashes, a source of potash, 199.
cotton hull, 199.


Bacteria, 68, 143.
and the farmer, 5, 144.