Buttercup, flower of, 129, 130.

  Cabbage, fertilizer for, 211.
    soil, 28, 161.
    transplanting, 87, 88.
    worm, 117.

  Cabbages, 4.

  Calcium in plants, 66, 67.
    in soils, 68.

  Calyx, 129.
    function of, 132.

  Cambium, 126.

  Canadian field pea, 189.

  Canteloupe soil, 28.

  Capillary force, 49.
    meaning of term, 49.
    tubes, 49.
    water, 153.

  Carbon in plants, 66.

  Carbonic acid in soil, 37.

  Carrots, 4, 6.

  Cauliflower soil, 28.

  Celery, 4.

  Cellulose in plants, 63, 66.

  Chain harrow, 102, 105.

  Chemical properties of a fertile soil, 147.

  Cherry flower, 129, 130.

  Chlorophyl in leaves, 113.

  Classification of soils, 26.

  Clay, 27, 38.
    and lime, 42.
    loams, 29.
    power to absorb water, 41, 42.
    relation to water, 25, 41, 43.
    soils, 29.
    soils injured by working when wet, 45.
    to improve texture of, 42.
    water-holding power, 44.

  Clevis, 93.

  Climbing plants, 121.

  Clover, 68. 
    Bokhara, 190.
    crimson, 189.
    mammoth, 189.
    red, 188.

  Clovers, as green manure-crops, 188.
    as nitrogen gatherers, 184.
    nodules on roots of, 184.

  Commercial fertilizers, 171, 192.
    amount to buy, 212.
    home mixing, 211.
    kind to buy, 212.
    raw materials, 192. 
    (See also Fertilizers.)

  Composts, 171, 181.

  Conditions necessary for root growth, 20.

  Corn, a humus waster, 226.
    depth of root growth of, 13.
    flower of, 132.
    germination of, 78, 79.
    in rotation, 226, 229, 234.
    plant, 6.
    pollination of, 133.
    rapid growth of roots of, 13.
    roots cut by plow, 14.
    soils, 28, 29, 30, 161.
    structure of seed, 78.
    water used by, 40.

  Corolla, 129.
    function of, 132.

  Cotton, 5, 161.
    a humus waster, 221.
    in rotation, 225-229.
    plant, 6.
    plant food removed by, 227. 
    Sea Island, 161.
    soils, 28, 29, 161.
    upland, 161.

  Cotton hull ashes, 199.

  Cotton-seed meal, 194.

  Cotyledons, 77.
    use of, 79.

  Coulter of plow, 94.

  Coulter-toothed harrow, 102, 104.

  Cow manure, 178.
    losses by exposure, 178.

  Cowpeas, 68, 186.
    for green manuring, 186.
    plant food in, 187.
    root growth of, 12.
    soils for, 187.

  Cropping and soil water, 159, 160.

  Crops, cleansing, 232.
    feeding, 232.
    in rotation, 219.
    manurial, 232.
    money, 232.