Pocket Gopher, Thompson-Seton's "master ploughman," 128; why he has that queer expression on his face, 128; how he spends the winter, 218 Pocket-Mouse, 130, 131 Pot Holes, soil-grinding mills of the rivers, 61 Prairie-Dog, his watch tower and how it protects him from his enemies, 126; his great sociability, 127 Rains, their work in making and transporting soil, 44, 55 Rivers, work of the river mills in soil making, 60 Roots, how lichens get along without them, 4; how and why they work at different levels, 11; how they make their way about (you won't wonder that Darwin said their actions suggested intelligence!), 186 Sand, how it helps the soil to breathe, 59 Seeds, how they determine the order of march of the trees, 12; use of screw-propellers and other devices, 42, 49, 51; how and why baby plants back into the world, 190; how they tried to change a sprouting seedling's mind but couldn't, 195; how "rag babies" tell the fortune of corn, 199 Shrews, their work as ploughmen, 115; where they spend the winter, 218 Siberia, there you will find the voles and their root cellars, 212 South America, home of the four-footed farmers that wear armor, 120; and of the viscacha, 127; a good place to look for flamingoes, 166; and for oven-birds, 171 South Sea Islands, one of the regions in which you find birds that hatch their babies with an incubator, 174 Squirrels, how they help the trees to march, 14; the winding streets of Ground-Squirrel Town, 123; marmots, the largest of the squirrel family, 124; how the tree-squirrels spend the winter, 218 Swallows, their habits and their service as soil makers, 177 Termites, insects improperly called "white ants"; their habits in relation to the history of the soil, 100 Terracing, how employed to prevent waste of soil, 71 Texas, you can still find armadillos there, 120 Trees, their settled order of march into new lands, 8; how the winds and the rains help trees to climb the western slopes of mountains, 55; how waste of trees causes waste of soil, 69 Turtles, how turtles differ from tortoises; habits of both these water farmers, 137; how turtles differ from crabs in their notions about laying eggs, 142 Viscachas, South American relatives of the prairie-dogs; their villages and their athletic fields, 127; how they rescue their buried comrades, 128 Volcanoes, their contribution to soil making, 39; how they help the plant world to get its breath, 40; team-work between volcanoes and lichens, 235 Voles, four-footed farmers who fill root cellars for the winter, 212 Wasps, their habits in relation to the history of the soil, 102 Weather and the groundhog's shadow, 219 Weeds, as soil makers, 9