Illustration: HARROW.
These instruments are used to stir up, pulverise, and mix together
the earth, also to tear up any roots that may be left after
ploughing, and to cover up the seed after sowing. The cut represents
the usual form of harrow, having a number of iron spikes or teeth
attached to frames of which two or more are united together by chains
and attached to a bar, that the horses may drag them over the surface
of the soil.
Bush-harrows consist of a bundle of brush-wood held together by a
pair of frames, and drawn over the soil when it is very dry and
light; they are used chiefly to cover up the seed after “drilling.”