rs it around in the same
operation. Long helical-shaped screws, horizontally fixed between
uprights or set on a swivel on a single high tower, can be used for
loading the breeze with a finely divided shower of water and thus
projecting the moisture to very long distances. A windmill of the
ordinary pattern, as used for gardens, may be fitted with a long
perforated pipe, supported by wire guys instead of a vane, a
connection being made by a water-tight swivel-joint between this pipe
and that which carries the liquid from the pump. In this way every
stroke of the machine sends innumerable jets of water out upon the
wind, to be carried far afield.

Gardening properties in comparatively dry climates, fitted with
machines of this description, can be laid out in different zones of
cultivation, determined according to the prevailing directions of the
wind and the consequent distribution of the water supply. Thus if the
wind most frequently blows from the west the plants which require the
most water must be laid out at the eastern side, not too far from the
sprinkler. Facilities for shutting off the supply of spray at will
are, of course, very necessary. The system of watering founded on this
principle depends upon the assumption that if the gardener or the
farmer could always turn on the rain when he has a fairly good wind he
would never lack for seasonable moisture to nourish his crops. This
will be found in practice to apply correctly to the great majority of
food plants. In the dry climates, which are so eminently healthy for
cereals, "the early and the latter rains," as referred to in
Scripture, are both needed, and one of the most important applications
of cheap power will be directed to supplementing the natural supply
either at one end or at the other.

The "tree-doctor" will be a personage of increasing importance in the
rural economy of the twentieth century. He is already well in sight;
but for lack of capital and of a due appreciation of the value of his
services, he occupies as yet but a comparatively subordinate position.
Fruits, which are nature's most elaborately worked-up edible products,
must come more and more into favour as the complement to the seed food
represented by bread. As the demand increases it will be more clearly
seen that an enormous waste of labour is involved in the culture of an
orchard unless its trees are kept in perfect health. At the same time
the law of specialization must operate to se