X TABLE OF CONTENTS 



CHAPTER PAGK 



84. Paths of Cyclonic Storms across the United States . 1 70 



85. Sudden Weather Changes ; Cold Waves ; Blizzards ; 



Hot Spells 171 



86. Weather%orecasting ; Weather Bureau . . . 1 74 



87. Climate . . 174 



88. Effect of Climate upon Animals and Plants . .175 



89. Effect of Climate upon Man 177 



VI. THE LIVE PART OF THE EARTH. 



90. Plants and Animals . . . ' . .182 



9 1 . Plants ; Parts of a Plant 1 82 



92. Plant Roots; Cells; Protoplasm; Osmosis; Capil- 



larity 183 



93. Stems; Monocotyledonous ; Dicotyledonous; Cam- 



bium Layer ; Budding ; Grafting . . 1 88 



94. Leaves ; Functions ; Chlorophyll ; Carbohydrates ; 



Proteins; Stomata 193 



95. Flowers ; Calyx ; Corolla ; Anther ; Stamen ; Pistil ; 



Stigma ; Ovary ; Style ; Pollen . . . 200 



96. Seed Dispersal 205 



97. Seeds and their Germination ; Sprouts ; Cotyledons 206 



98. Fungi ; Parasites ; Saprophytes .* 209 



99. Bacteria; Disinfectants; Germs . . . .212 



100. Animals 217 



101. Classification of Animals ; Invertebrates ; Vertebrates 2 1 7 



102. Invertebrates; Protozoa . . .". . ^ .218 



103. Worms . .220 



104. Insects ; Silk Worms ; The Honey Bee . . .221 



105. Vertebrates; Man; Skeleton; Brain; Spinal Cord; 



Nerves . . . . **'," 224 



106. Respiration; Windpipe; Lungs; Diaphragm; Cap- 



illaries . 225 



107. Circulation; Heart; Veins; Arteries; Corpuscles . 227 



108. The Senses: Sight; Hearing ; Taste ; Smell; Touch 230 



109. Food; Alimentary Canal ; Digestion . . . 232 



110. Necessary Foods ; Carbohydrates; Proteins; Fats. 235 



111. Preparation of Foods ; Cooking .... 238 



VII. LIFE OF THE EARTH AS RELATED TO PHYSICAL CON- 

 DITIONS. 



1 1 2. Ancient Life History ; Fossils ; Petrified Trees . 242 



113. Distribution of Life . . . 243 



114. Adaptability of Life ; Fauna; Flora . . . 245 



