SHEEP IN WOLVES' CLOTHING AND WOLVES IN SHEEP'S CLOTHING (SEPTEMBER) [Illustration: THE LOBSTER MOTH CATERPILLAR Pretending to be a Spider] The wolves and sheep I am going to talk about are all of them insects, or rather all of them but one, for scientific people do not allow us to call spiders insects. Insects have six legs and six legs only, while spiders and mites and those sort of people have eight, and there are a great many other differences between spiders and true insects which would make it quite a dreadful blunder to put them in the same case in the Museum, or to speak of them in the same breath when you know you are talking to clever people. The Spider, as you might guess, is one of the Wolves, and so is the Dragon in the Water-weed, who turns into one of our largest dragon flies, if he is lucky; while the caterpillars and the Giant Wood Wasp are just silly harmless sheep. Have you ever thought of the wonderful struggles which are always going on in the insect world--the struggles to eat, and the struggles not to be eaten? Nearly all insects seem to be the food for something or other. Most animals enjoy them thoroughly, so do many birds, and many reptiles and amphibians (frogs and toads) and many fish. I think that spiders live on them entirely, and they have also cannibals to fear among their own kind, for though most insects feed on plant-juice, quite a large number of them turn to stronger meat, and spend their lives in hunting their poor relations. It sounds rather horrible, doesn't it? But we may be quite sure that everything of the kind has been mercifully arranged so that this beautiful world of ours, with all its joy and colour, and its millions and millions of happy children--I do not think that any lives but those of human beings are ever really unhappy--may keep its beauty always. That is why the ichneumon flies have to kill down the caterpillars, for, if there were too many caterpillars, there would be no hedgerows, let alone vegetables for dinner; and the Rove Beetles, who have curly cock-up tails, have to kill down the little boring beetles, for, if there were too many little boring beetles there would be no trees; and the Crabros have to kill down the blue-bottles, for if there were too many blue-bottles--well, goodness knows what _would_ happen to some excitable people. We must believe then that things are best as they are--that a struggle for life is part of a Great Plan, Greater than our human minds can grasp, and that the lives of the hunters are as useful in their way as the lives of the hunted.