xvi LIST OF ILLUSTRATIONS 



FIG. 



79. Weather map showing a storm just entering the country 



and one just leaving it 157 



80. Cumulus cloud bringing rain 158 



81. A view from Mt. Tamalpais, showing fog billows . . 160 



82. Young plant of pigweed 167 



83. Seedling of mayweed 168 



84. Young plant of groundsel 168 



85. Young plant of sow thistle . 169 



86. Seedling of mallow 170 



87. Young plant of plantain or rib grass 171 



88. Musky and red-stemmed filaree (rosettes) .... 172 



89. Musky and red-stemmed filaree (adult plants) . . . 173 



90. Filaree seed burrowing into moist cotton .... 174 



91. Young plant of sorrel 175 



92. Seedling of wild mustard 176 



93. Seedling of milk thistle 176 



94. Small plant of turkey weed 177 



95. Seedling of bur clover 178 



96. Poison oak or poison ivy 180 



97. Alfalfa butterfly 185 



98. Moth clinging to the cocoon out of which it has just come 186 



99. Sphinx moth 187 



100. Eggs of a California oak caterpillar 188 



101. Pupa of tomato sphinx moth 188 



102. Codling moth at work in a young apple .... 189 



103. Tussock moth or horned caterpillar 189 



104. Worm (larva) of peach borer .191 



105. Pupa of a peach borer 191 



106. Peach worm 191 



107. Burrow of peach worm 192 



108. Burrow of a peach worm. (Enlarged) .... 192 



109. Army or cut worm 193 



110. Moth of army or cut worm 194 



111. Ladybird which eats scale insects and plant lice . . 196 



112. A ladybird larva is seen eating a mealy bug half its size . 197 



113. Diabrotica, which does much damage . . - . . . 198 



114. Leaf eaten by graperoot worrn 198 



