[51] Arthur M. Judy: _From the Study to the Farm_. By courtesy of The Atlantic Monthly Company.
Analyze the life of the iron-worker, the country doctor, the head-nurse of a city hospital, the college professor, the private detective.
XII. Would you classify the following selection as formal or informal classification or partition?
Write a similar treatment of fuel power, moral power, physical strength, intellectual power.
Wherever rain falls streams will form, the water of which represents the concentrated drainage of all the land sloping toward that particular valley at the bottom of which the stream flows. This stream flow consists of the rainfall over the whole watershed less the amount absorbed by the earth or evaporated from the surface, and every such stream is a potential source of power. The possible water-power of a country or district is, therefore, primarily dependent on rainfall, but also, of course, on absorption and surface evaporation. In places where the land is approximately flat, the tendency to concentrate rainfall into streams would be small, as the water would tend to lie rather in swampy low pools, or form innumerable tiny, slowly moving brooks. On the contrary, if the country were of a rolling or mountainous character, there would be two important differences introduced. First, water would concentrate in a few larger and faster-moving streams, the water of which would represent the collection from perhaps thousands of square miles; and secondly, it would be constantly falling from higher to lower levels on its way to the sea. While, therefore, all streams are potential, or possible sources of power, and water-power might seem to be available all over the earth, yet, as a matter of fact, only those streams that are large enough or in which the fall of level is great enough, are really worth while to develop; and only in these districts where the rainfall is great enough and the earth not too flat or too absorbent, or the air too dry, may any streams of useful character at all be expected. The power represented by all the water of a stream, and its entire fall from the source to the sea, is likewise only partly available. No one would think of trying to carry water in pipes from the source of a stream a thousand miles to its mouth for the sake of running some water-wheels.[52]