xiv ILLUSTRATIONS 



30. Sweet-potato Plants may be Grown from Potatoes in Hotbeds 52 



31. Cross-section Showing Construction of Hotbed 53 



32. First Two Steps in Making a Temporary Hotbed 54 



33. Two More Steps in the Preparation of a Temporary Hotbed . . 54 



34. Two Last Steps in Preparing a Temporary Hotbed 54 



35. Two Pots of Soil, Corn Growing in One, Immersed in Water 



to Show Difference in Evaporation 58 



36. Plants Grown in Glass Bottle Wrapped in Dark Paper 58 



37. Germinating Oats and Barley 59 



38. A Potted Plant with Glass Inverted Over it, Showing Moisture 



Given Off by Leaves 60 



39. Experiment with Egg to Show Osmosis 61 



40. Potato Tubers Sprouted in Light and in the Dark 63 



41. A Sunhght Aquarium 64 



42. Tests with Fertilizers made in Glasses, Tin Cans, and Flower 



Pots 66 



43. Melons Grown from Unselected Seed — Showing the Mixed 



Product 67 



44. Melons Grown from Selected Seed 67 



45. Hubbard Squash Cut Open, Showing Seed Cavity 68 



46. Tomatoes Cut Open, Showing Seed Cavity 68 



47. An Exercise to Test the Depth for Planting 71 



48. A Lens 74 



49. A Reference Collection of .Seeds to Use in Detecting Impurities 



in Seed Samples , 75 



50. A Collection of Garden Seeds 76 



51. Selecting Seed Potatoes 79 



52. Growth, Yield and Marketable Crop Produced by WeU-selected 



and by Poor Seed 80 



53. The Poppy 81 



54. Strawberry Blossoms 82 



55. Equivalents in Different Forms of Lime 85 



56. Crimson Clover 86 



57. Manure for Garden Should Be Well Rotted 91 



58. Squares Showing Proportion of Valuable Ingredients in Ton of 



Fertilizer 97 



59. Garden-pea Roots 100 



60. Beautifying Vacant Lots, Los Angeles 108 



61. Over-head Irrigation System for Children's Gardens, Da3rton, O. 109 



62. Irrigation Water Conducted to Edge of Garden in Wooden 



Trough or Flume 110 



63. Underdrains Encourage Roots to Feed Deeper Ill 



