LIST OF EXPERIMENTS xix 



SECTION PAGE 



116. Expt. 60. Specific Gravity Bouyancy . . . .161 



117. Expt. 61. Surface Tension 163 



118. Expt. 62. Capillarity 165 



119. Expt. 63. Osmotic Pressure 167 



120. Expt. 64. The Removal of Stains 169 



121. Expt. 65. Acids, Bases, and Salt Neutralization . . 172 



122. Expt. 66. Efflorescence and Deliquescence . . . 174 



123. Expt. 67. To Make Soap 175 



124. Expt. 68. Temporary Hardness . . . . .177 



135. Expt. 69. Sedimentation . . . . . .190 



136. Expt. 70. To Test Rocks . . 192 



138. Expt. 71. Distillation of Petroleum 195 



145. Expt. 72. Water Capacity of Soils 203 



149. Expt. 73. The Effect of Mulches '. 209 



151. Experiment for the Teacher 213 



Expt. 74. Air Necessary for Roots 213 



158. Expt. 75. The Effect of Lime Acid Soils . . .221 



163. Expt. 76. Effect of Roots on Soil 227 



164. Expt. 77. The Pressure of Sap 228 



165. Expt. 78. Transpiration 229 



168. Expt. 79. Seed Testing Germination . . . .233 



169. Expt. 80. To make Lemon Extract 234 



175. Expt. 81. Sources of Alcohol 243 



186. Expt. 82. The Lever 253 



190. Expt. 83. Test for Bad Air . . . . ' . .258 



192. Expt. 84. Digestion of a Proteid 261 



193. Expt. 85. The Amount of Water in Vegetables . . 263 



195. Expt. 86. Composition of Food 265 



Expt. 87. Test for Food Preservatives and Colors . . 267 



196. Expt. 88. Water Analysis .269 



199. Expt. 89. Persistence of Vision Fatigue . . . 273 



200. Expt. 90. The Origin of Sound Music .... 275 

 Expt. 91. The Megaphone and the Mechanical Telephone 275 



209. Experiments for the Home 291 



210. Expt. 92. Dyeing 293 



