The songs and games cannot be happily carried on unless each child is not only willing to help, but willing also to give up his chief desires now and then. All the children would like to be the flowers in the garden, perhaps, but it is obvious that some must remain in the circle, in order that the fence be perfect, and prevent stray animals from destroying what we love and cherish. So there is constant surrendering of personal desires in recognition of the fact that others have equal rights, and that, after all, one part is as good as another, since all are essential to the whole. In coöperative building, the children quickly see that the symmetrical figure which four little ones have made together, uniting their material, is infinitely larger and finer than any one of them could have made alone. If they are making a village at their little tables, one builds the church, another workshops and stores, others schools and houses, while the remainder make roads, lay out gardens, plant trees, and plough the fields. No one of the children had strength enough, time enough, or material enough to build the village alone, yet see how well and how quickly it is done when we all help! The sand-box, in which of course all children delight, lends itself especially to coöperative exercises. They gather around it and plant gardens with the bright-colored balls; they use it for geography, moulding the hills, mountains, valleys, and tracing the rivers near their homes; they arrange historical dramas, as "Paul Revere's Ride," or the "Landing of the Pilgrims:" but no child does any one of these things alone; there is constant and happy coöperation. It is the aim of one day's exercise, perhaps, to retrace with the child the various steps by which his comfortable chair and his strong work-table have come to him. Across one end of the sand-box, a group of children plant a forest with little pine branches which they have brought. The wood-cutters come, fell the trees, and cut away the boughs. Another party of children bring the heavy teams, previously built from the play-material, harness in the horses (taken from a Noah's Ark), and prepare to carry off the logs. Now here come the road-makers, and they lay out a smooth, hard road for the teams, reaching to the very bank of the river, which another party of little ones has made. The logs are tumbled into the stream; they float downward, are rafted, carried to the mill; little sticks are furnished to represent the boards into which they are sawn; and the lumber is taken to the cabinet-maker, that he may fashion our furniture. Though there be twenty children around the sand-box, yet all have been employed. Each has enjoyed his own work, yet appreciated the value of his neighbor's. They have worked together harmoniously and the doing has reacted upon the heart, and strengthened the feeling of unity which is growing within.