[Illustration: FIG. 118.--Man's strength is not sufficient for heavy
work.]
Figure 118 shows one way in which a horse's energy can be utilized in
lifting heavy loads. Even the fleeting wind has been harnessed by man,
and, as in the windmill, made to work for him (Fig. 119). One sees
dotted over the country windmills large and small, and in Holland, the
country of windmills, the landowner who does not possess a windmill is
poor indeed.