Harvesting the Sun

1896

When we sit in front of a coal fire and enjoy its generous warmth, do we realize that the heat and light of the burning coal are really sunshine that has been stored up for ages? Such is the fact. Centuries ago the sun shone on the earth, the plants and trees grew, fell, and grew again; they were covered by geologic deposits, and acted upon by great heat and pressure, until in the course of years and ages these broad layers of organic matter were transformed into coal. The coal thus represents the work done by the sunshine years ago, and when it is burned the imprisoned solar energy is loosened again.

Our system of power production depends upon this presence of energy. But coal is a wasteful source of energy. Even the best engines do not utilize over 10 per cent of the calculated energy of the heat of coal. And, besides this it is an inconvenient thing in many ways; it has to be mined, freighted and stored. Can we not find some more economical way of using the sun's energy?

During the last few years the great progress in electrical science has enabled man to utilize the solar heat in a thriftier way. During its day's work the sun draws up a large amount of water from the oceans and damp earth. By the action of its rays plant life flourishes, and plants draw from the ground and evaporate into the air large amounts of water. Thus an oak tree of average size, with seven hundred thousand leaves, lifts from the earth into the air about one hundred and twenty-three tons of water during the five months it displays its foliage. This evaporated water, sooner or later, falls as rain, and by the action of gravity begins to flow downward. Thus the great rivers are fed. Round and round incessantly goes the water lifted by the tireless sun to fall when deserted by him, and again to fall and run seaward as long as it may exist upon this earth.


Peculiar to the Locality

Some interesting discoveries have recently been made about animal life on the Hawaiian Islands. It appears that all the land and fresh water shells are peculiar to the locality. Nor is that all. Fifty-seven out of the seventy-eight species of birds, and seven hundred out of the one thousand species of insects do not exist in any other portion of the globe.

Why Some People Are Poor

1879

Silver spoons are used to scrape kettles.

Coffee, tea, pepper and spice are left to stand open and lose their strength.

Potatoes in the cellar grow, and sprouts are not removed until the potatoes become worthless.

Brooms are never hung up, and are soon spoiled.

The flour is sifted in a wasteful manner, and the bread-pan is left with the dough sticking to it.

Clothes are left on the line to whip to pieces in the wind.

Tubs and barrels are left in the sun to dry and fall apart.

Dried fruits are not taken care of in season, and become wormy.

Bags, strings and paper are thrown into the fire.

Pork spoils for want of salt, and beef because the brine wants scalding.

Bits of meat, vegetables, bread and cold puddings are thrown away, when they might be warmed, steamed, and served as good as new.

—The Bucks County Gazette, Bristol, Pennsylvania, Feb. 20, 1879, p. 1.

The Influence of Man Upon Climate

1877

The influence of man upon climate has been a favorite subject of late years, and it is now well known that, by cutting down forests and draining the soil, men can materially change the climate of a country.

Some recent experiments conducted in Germany confirm this belief, by showing the extent to which woods will affect the rainfall. Two observatories were established for the purposes of comparison — one over a clump of trees forty feet high, and the other over a bare sandy plain about three hundred yards from the forest. Both observatories, were built at the same height from the ground. Twelve months' observation showed that of the total rainfall within that period ten per cent more rain fell over the trees than over the bare sand distant three hundred and thirty yards from them. Further, the air above the wood was charged with aqueous vapor to the extent of ten percent in excess of the air over the barren open soil. The ground too, under the trees, retained far more water than the exposed earth, evaporation from the surface, thanks to its shade of trees and moss, being only one-sixth of that outside their friendly shelter.

These results are valuable in that they point out a possible means of improving the condition of sterile tracts, i.e., by planting trees.