At this time, the cabbage was removed so that the eggs and the remaining young caterpillars could be observed. The protecting coloring of the eggs and caterpillars was first noticed. One little boy at first announced that the caterpillars were green because they were not ripe, a good example surely of the danger of reasoning from analogy! Very soon the inhabitants of this terrarium world began to increase. A father and two mother grasshoppers and a young one, with his "armor on," came to live there; also a "woolly bear," several other species of caterpillars, several species of beetles, a big horse-fly, some lady-bugs, and a cicada. About this time too, some very unwelcome immigrants appeared. These were the ichneumon flies. So numerous did they become in a very short time, that they threatened desolation to this prosperous community. Nature's methods were then scrutinized and the services of two tree-toads were sought. Their response was immediate and cordial. Soon not an ichneumon fly could be found. [Illustration: _Fig. 127. Hand over hand._] The grasshoppers were partial to celery, over-ripe bananas, and moisture. Three days after they became inhabitants of this miniature world, the mother grasshopper dug a hole in the ground and laid eggs. The observing children then had before them living illustrations of the three stages of grasshopper life. The tree-toads were both amusing and accommodating. They, too, liked the wire netting at the ends of the terrarium, and delighted the children by climbing up foot over foot, or hand over hand, like odd four-handed sailor boys (Fig. 127.) This brought into plain view the tiny suckers on their feet. After the ichneumon flies had disappeared, a new difficulty arose. The ground became mouldy, and the grass died down. The terrarium was then placed by an open window and left there several hours for a number of days until it was thoroughly dried out. Then bird-seed was planted and the ground was watered thereafter with a small plant syringe. This gave sufficient, but not excessive moisture, and it was one of the pleasures of the children to imitate a rainy day in the terrarium world. And it was a pleasing experience, for there were splashes of water on the glass sides and many shining drops on the netting and verdure, which soon grew several inches tall; there was the same delightful odor of rich fresh earth that one enjoys during summer rains, and the sunshine touched with brilliancy the gay fall flowers and the gorgeous outspread wings of the butterflies.