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Most Trees in Smallest Area
By H. C. Dunlavy
HE deltoid system will acre will contain as many trees set out probably prove of more by the deltoid system as one acre will interest to pomologists where the trees are set out in the form than to people of other of squares, or 86.6 acres in the first case vocations. By using this equal to 100 acres in the second case. Or
system, a greater number if a tract of land would contain, under of trees per acre may be planted at a the present system of planting, 1,000 given distance apart, than by any other system. It seems to be the general impression that the system of planting in squares is the one which accomplishes the above desideratum, but the following will prove that this impression is a delusion.
Figure 1 represents seven trees planted by the deltoid system and we will suppose them to be one rod apart. The inner hexagon represents the exact area occupied by one tree exclusively, which area is equal to that of two of the equilateral triangles formed by the trees. Since the sine of 60o = .866 it is evident that this area equals .866 square rods. Figure 2 represents nine trees planted one rod apart in the form of squares, and the inner square represents the exact area occupied by one tree, which area is one square rod. It is now evident that when
trees, at a given distance apart, it would, planting the same distance apart .866
under the deltoid system, contain
to the shape of the plant.
Fig. 2. THE Deltoid SYSTEM OF PLANTING TREES.
FIG. 1. THE WAY TREES ARE ORDINARILY PLANTED.
Dry Farming in the West
By W. Thomas
Streams nor even so much
ODERN science has de- mere deep plowing will not secure retencreed that deserts may be
tion of the moisture. A packing process fertile, though there be must follow hard upon the turning of neither running the soil. A special machine is used for
this purpose. Mr. Campbell has made sevas a pool of stagnant water, eral inventions to be applied to this use. Mr. H. W. Campbell, a native of Ver- After the crop is once in, constant surmont, now residing in Lincoln, Nebraska, face cultivation must be maintained, but has accomplished this seeming marvel. that no moisture may be squandered Without irrigating ditches or wells, but penetration of the soil ends with a depth solely by his already famous method of of two or three inches. Perhaps the dry farming, he is making the "Great most peculiar feature of the Campbell American Desert" bloom. His system is system is that as time goes on, year by quite simple. It consists in retaining the year the soil will be found to have gained moisture in the ground by a process of in its accumulation of moisture. The packing the sub-soil, so that twelve inches dust that is scratched up from time to of rainfall, properly conserved, will suf- time covers the soil below like a protectfice to turn a region from cattle-raising ing blanket. to agriculture.
Each fruit or grain, according to its In North America there is a compara- kind, requires a varying degree of attentively arid region extending eastward tion. Garden vegetables and corn must from the Rocky Mountains some hun- be cultivated a dozen or more times in dreds of miles, and linking the plains of the season ; small grains after each rain Assiniboia with those of Texas. Parts until they are several inches high; fruit or the whole of eleven states and terri- trees must have constant care. tories and two provinces are included Mr. Campbell began his experiments within this area. From a poverty- in 1883, though it was ten years before stricken desert, plagued by crop failures the discoverer won his first triumph. and heavily ridden with mortgages, the This was in South Dakota, where in 1893 system of dry-farming is gradually but
he turned out 124 bushels to the acre, surely restoring this region to a prosper- while his scoffing neighbors, who stood out farming land.
by their New England methods, met with And this is the way Mr. Campbell's a total crop failure. Since then thoumethod is put into operation. The nature sands of acres have been reclaimed. Irriof the prairie soils is such that water is gation has found a rival in a system that absorbed by them as oil is by a wick. makes a single drop of water go twice Here, then, deep beneath the surface, as far as in climes where rainfall is more moisture is retained as in a reservoir. abundant. Government experts are now Exposure of this sub-soil means speedy conducting important experiments with evaporation and, of course, no crops. But the Campbell system.
Postal development in China has neces
Air that has been inhaled has a higher sitated a revision in the spelling of Chi- electrical conductivity than has normal nese city names.
A French invention, consisting of bulb Cotton growing in Peru dates back thermometers, predicts sundown beyond the time of the Spanish conquest. whether there will be a frost.
The cattle egret of India is a bird Beira, a little town in Africa, is built that follows grazing cattle to secure disalmost entirely of galvanized sheet metal. turbed insects.
A Frenchman is said to have discov
A violin played with four bows by elecered a means of firing torpedoes by wire tricity is the latest invention of a Chiless electric power.
The inhabitants of ancient Gaul of Portugai is making an effort to re
France built houses of terra cotta. claim 10,000,000 acres, nearly one-half the country's area.
The Erzberg, Austria's iron mountain,
will furnish ore for 1,000 more years. It is proposed to grade French troops not according to height but to length of stride.
The only substitute for San Domingo
mahogany is that of East India. In Rhodesia, Africa, at Broken Hill, nearly 1,000,000 tons of lead and zinc The huge serpent, the boa constrictor, are in sight.
has 320 pairs of ribs.