Soon these thick leaves moved apart, the woolly covering came off, and what a month ago was a little woolly body, so tiny that it had to be picked apart with a needle, was now a large stout branch, smooth and green, and bearing beautiful broad leaves. Some of the buds brought forth small clusters of little green balls. These the boys at first thought were berries, but they afterwards found out that they were flowers. After all the buds had quite opened out, they began slowly to wither. Uncle George told them the reason of this. It was because the branch had been cut away from the mother-tree, which drew its food from the soil and air. The growing buds had used up all the sap which the cut branch contained. But by the time their twigs had withered, the buds outside had began to open—for spring was now at hand. The hedges were becoming greener every day. The birds were heard singing in the woods, and little green shoots were springing up everywhere under foot. Frank and Tom brought home opening buds of all kinds, and watched the hedges and trees as they walked daily to school. Two of the bean seeds were dug up out of the sawdust every second or third day. In this way the boys were able to see exactly how a bean plant grows from seed. [Illustration: Stages in the Germination of the Runner Bean. In 1 and 4, inside of seed, growing baby plant is shown.] First the seed swells out; then the skin bursts, and the little plant in between the two masses of plant-food begins to grow. The root always grows down straight. The little shoot always grows upwards. After the root has grown about an inch it begins to branch; and in about two weeks these branch branch-roots are searching the soil for food all around the main root. The shoot meanwhile is growing in length and thickness. It remains folded up until it reaches the air and light. Then its leaves open out and turn from a creamy colour to bright green. One small box of seeds was placed in a dark cupboard. These beans grew much more quickly than those grown in the light; but they were pale, lank, and sickly. They never turned green. From this the boys learned that the green colour of leaves and stems is due to the action of light. Uncle George took a few grains of wheat and placed them upon wet blotting-paper. A tumbler turned upside down was placed over them. In a few days the children saw that a few small roots had grown out from the end of each grain. When these roots had grown to about half an inch in length, great tufts of long slender hairs sprang out all round them near their tips. These, their uncle told them, were “root-hairs.” The root-hairs of a plant are so fine that they are always torn off when we dig or pull a plant out of the ground. It is by means of these slender root-hairs that the plant is able to suck water out of the soil; and this water always contains a very little plant-food in it.