Ice Ages, how the glaciers ploughed and mixed the soil, 237 Insects, their service in pulverizing and fertilizing the soil, 92; damage done by injurious insects, 93; relation of insects to crustaceans, 143 Kangaroo rat, 131 Kingfishers, their tunnel homes in the bank and how their fishing habits help enrich the soil, 171 Kiwi, a late bird that nevertheless gets the worm, 167 Lichens, first of the soil makers--how they helped Columbus discover the world by discovering it first, 1; how the volcanoes and the lichens work together, 235 Lizards, reign of the lizard family in the days of the prehistoric monsters, 25 Lubbock, Sir John, the great London banker who carried ants in his pocket--what he had to say about the pleasures of Nature Study, 231 Maeterlinck, on the presence of mind of a tree and its heroic struggle against adverse circumstances, 200 Marmots, their farm villages, 124 Mason-Bees. The house that Mrs. Mason-Bee built and its relation to the story of the soil, 104 Moles, their work as ploughmen, 115; how they do their tunnelling, 117; Mr. Mole's castle under the ground, 118; how he keeps his hair so sleek, 119; where he spends the winter, 218 Monsters, prehistoric, what they looked like, their habits and how they help the farmers of to-day with their farming, 20 Mosses, as soil makers, 8 Mound-Birds, how they build their incubators; other interesting habits, 174 Mountains, how the trees climb them, 13; why you always hear a rattle of stones in the mountains at sunrise, 43; how the winds help trees to climb the western slopes, 55; how the mountains help the rain to come down and why so many rivers rise in mountains, 56; why the bones of the monsters are found in the mountains, 31; how the mountains helped kill off the monsters, 32; farm villages of the marmots in the mountains, 124; team-work between mountains and pebbles, 240 Nature Study, its great value, 231; how it is taking the place of cruel sport, 232 New England, why its soil is so versatile and dependable, and how it helps grow farm boys into famous men, 239 New Zealand, home of a bird that is a very late riser but nevertheless gets the worm, 167 Oven-Birds, of South America, how they differ from the American oven-birds, 172; their remarkable adobe homes and their friendliness toward man, 172 Pebbles, how they help feed the Wisconsin cows, 239, 240; team-work between mountains and pebbles, 240 Philippines, one of the regions where mound-birds live, 174, 176 Ploughing, Nature's system: work of the squirrels, 14; of the elephants and their ancestors among prehistoric monsters, 27; of the Moas, 28; of the Dinosaurs, 29; storm ploughs of the winds, 46; use of the plough to prevent soil waste, 70; the great ploughs of the Ice Ages, 237