Fallow, bare, 100.

  Fall plowing, 99.

  Families of plants, 86.

  Farm drainage, 235.

  Farm manures, 171, 183.
    classification of, 171.
    importance of, 172.

  Farmer deals with agents, laws and forces, 5.

  Fat in plants, 64.

  Fermentation of manures, 174.

  Fertile soil, a, 141.
    biological properties of, 142, 143.
    chemical properties of, 142, 147.
    most important properties of, 150.
    physical properties of, 142.

  Fertility of the soil, 150.
    economizing the, 150.
    maintaining the, 150.

  Fertilizers, commercial, 68, 192.
    analysis of, 203.
    classification of, 171.
    home mixing, 211.
    how to know what kind is needed, 212.
    importance of thorough mixing with the soil, 15.
    manufactured, 202.
    many brands, 202.
    mixed, 202.
    raw materials, 192.
    sources of lime, 193, 200.
    sources of nitrogen, 193.
    sources of phosphoric acid, 193, 195.
    sources of potash, 193, 199.
    use of by farmer, 172, 192.
    value of plant food in, 205.

  Filament of stamen, 129.

  Film water, 50.

  Fish scrap as a fertilizer, 194.

  Flower,
    of apple, 129, 130.
    of buttercup, 129, 130.
    calyx, 129.
    of cherry, 129, 130.
    corolla, 129.
    of cucumber, 133.
    functions of parts of, 130.
    of honeysuckle, 129.
    of melon, 133.
    parts of, 129.
    of peach, 129, 130.
    petals, 129.
    of petunia, 129.
    pistil, 130.
    pollen, 130.
    of potato, 129.
    sepals, 129.
    stamen, 129.
    of squash, 133.
    of tomato, 129.
    of wild mustard, 129, 130.

  Flowers, 8, 128.
    essential parts of, 131.
    functions of, 130.

  Food of plants, 63.

  Forces of nature and the farmer, 5.

  Forest soils, 29.

  Foundation facts and principles of agriculture, 22.

  Free water in the soil, 48, 153.
    injurious to roots, 153.
    source of capillary and film water, 153.

  Fresno sand, 28.

  Fruit, 8, 136.

  Fruit soils, 29.

  Fruits, 27.

  Furrow slice, 96.

  Gas lime, 201.

  Geranium, 6.

  Germinating seeds,
    need air, 73.
    need heat, 73.
    need water, 71.

  Germs, 143.
    denitrifying, 144, 147.
    nitrifying, 144, 145.
    nitrogen fixing, 144.

  Goosefoot family, 86.

  Gourd family, 86.

  Grafting, 136.

  Grain crops humus wasters, 224.

  Grain soils, 28.

  Grass, 5.
    family, 86.
    soils, 28, 29, 30, 162.

  Gravel, 26.