Few materials on the earth are more important than the soil; it acts as the intermediary between man and the earth. The rocks have some substances locked up in them which animals need; by decay, or by being ground up, the rocks crumble so that plants may send roots into them and extract the substances needed by animals. Gifted with this wonderful power the plants grow and furnish food to animals, some of which is plant-food obtained from the rocks; and so the animals of the land, and man himself, secure a large part of their food from the rocks. It is then worth the while to stop for a moment and think and study about this, one of the most marvelous of the many wonderful adjustments of Nature, but so common that most persons live and die without even giving it more than a passing thought. LEAFLET IX. A HANDFUL OF SOIL: WHAT IT DOES.[11] BY L. A. CLINTON. [11] Nature-Study Quarterly, No. 2: Leaflet 15, October, 1899. [Illustration] The more one studies the soil, the more certainly it will be found that the earth has locked up in her bosom many secrets, and that these secrets will not be given up for the mere asking. As mysterious as the soil may appear at different times, it always is governed by certain laws. These principles once understood, the soil becomes an open book from which one may read quickly and accurately. USES OF THE SOIL. The soil has certain offices to perform for which it is admirably fitted. The most important of these offices are: 1. To hold plants in place; 2. To serve as a source of plant-food; 3. To act as a reservoir for moisture; 4. To serve as a storehouse for applied plant-food or fertilizer. Some soils are capable of performing all these offices, while others are fitted for only a part of them. Thus a soil which is pure sand and almost entirely deficient in the essential elements of plant-food, may serve, if located near a large city, merely to hold the plants in position while the skillful gardener feeds the plants with specially prepared fertilizers, and supplies the moisture by irrigation. Early in the study of soils an excursion, if possible, should be made into the woods. Great trees will be seen and under the trees will be found various shrubs and possibly weeds and grass. It will be noticed that the soil is well occupied with growing plants. The surface will be found covered with a layer several inches thick of leaves and twigs. Beneath this covering the soil is dark, moist, full of organic matter, loose, easily spaded except as roots or stones may interfere, and has every appearance of being fertile. SOIL CONDITIONS AS FOUND IN MANY FIELDS.