24. Capillarity of soils. To show the relative powers of
soils to take water from below 44

25. Water-absorbing and water-holding powers of soils 45

26. Capillary tubes. To show how water rises in small
tubes or is drawn into small spaces 48

27. Capillary plates 48

28. A cone of soil to show capillarity 49

29. To show the relative amounts of film-moisture held
by coarse and fine soils 49

30. To show the effect of a soil mulch 56

31. Soil temperature experiment 57

32. Charts showing average temperature of a set of dry
and wet soils during a period of five days 60

33. To show the value of organic matter 61

34. Soy-bean roots, showing nodules or tubercles 64

35. Garden-pea roots, showing tubercles or nodules 65

36. To show that seeds need water for germination 72