Place some of the wet clay in a pot and scatter fine seeds over it. The seeds may sprout and try to grow, but they will probably perish as tender roots are unable to push their way through the sticky clay. After all these experiments have been performed with the clay and sand, another experiment can be made by drying both the clay and sand and then mixing them together in equal parts. When well mixed place in a pot and scatter fine seeds upon the mixture. Water well, and place in a sunny window; and the plants will sprout and grow longer and better than in either the pure sand or pure clay. These experiments with the lump of clay show that if soil consists wholly of clay, it must be a poor place for plants. In every hard rain the water, instead of sinking into the soil to supply the plants, would run away over the surface and be wasted. After slow soaking rains the soil would remain wet and cold for a long time. When the sun dries the soil it splits and cracks and tears the roots of plants growing in it. This sticky, pasty soil sticks to spade and plows and we find it hard, slow work to cultivate it. A pure clay from these would appear to be a poor soil for plants. We must not, however, be led astray by our experiments, as it is not easy to find a soil composed wholly of clay. It is usually mixed with other things and then forms a valuable part of the best soils. Sand alone would be a poor soil. Clay alone would be a poorer soil. Mixed together and mixed with other things, they make a part of all good soils. Organic and Inorganic Matter.--Organic matter is something that has life, or has had life at some time. The organic matter in the soil has been supplied by animals and plants, in one way or another. All else is inorganic. Both organic and inorganic matters are necessary to the existence of plants. Peaty soils wholly organic will not grow plants, neither will sandy soils wholly sand. Inorganic matter forms the foundation of soils and generally forms from eighty to ninety per cent of the whole soil. Testing Soils for Clay, Sand and Organic Matter.--Take from the ground you wish to test, a peck of soil and place on a board in a round heap, and with a trowel stir it until completely mixed. Then pile into a heap and divide into four equal parts. Next weigh out eight ounces, and spread it out to dry. When dry weigh it and note the loss by air-drying. Next put the soil in a pan and place it in an oven for three hours. Then take the soil out of the pan and weigh it, noting the loss by fire-drying. It is now dry soil and to estimate the organic and inorganic matter, place an iron shovel over the fire, and when red hot put the dry soil on it, let it burn, stirring it occasionally as it burns. It will smoke and smoulder away to ashes and dust. When it ceases to smoke, carefully weigh the ashes. This ash represents the inorganic sand and clay parts of the soil. All the organic matter disappeared in the smoke.