CONTENTS XI 



58. Simple Measurement . . . . . 151 



59. Everything Has Weight. The Balance . 154 



60. Everything Occupies Space . . . . 159 



61. Density . . . . . . ... r . 160 



62. Drawings . . . . . , . . " .-. . 162 



63. Forces .. . . , . , . i . 164 



64. The Plumb-bob and the Pendulum j| ' . / . 167 



65. The Lever . ... -. \ . . 16S 



66. The Inclined Plane , . . " . ' ' : .' 170 



67. The Lodestone . .-...' .. '. '.>; . 174 



68. Steel Magnets . -.. .. , . . 175 



69. Weather Observations ... J. . . 182 



70. How to Make Blue-print Paper - . '. . 183 



71. Solar Heaters . . . . . . . 184 



72. Hot-Air Engines . . , ". , r 185 

 73 Fireproofing . . . . '. . . i 185 



74. Waterproofing .. . ... . . . . ISO 



75. Flavoring Extracts and Perfumes . . . . 187 



76. To Remove Grease Spots and Stains . . 188 



77. How to Make Soap . - . . ,. . 188 



78. Bread Making . .... l^ 



79. Alcohol for Industrial Purposes . . . 190 



80. The Pantagraph . . . . . .191 



81. Levelling .192 



APPENDIX. 



Reference Books on Birds . . ... 195 



Reference Books on Flowers . . . . 195 



Reference Books on Trees . .^ . . . 195 



List of Apparatus and Materials . . : . . 196 



