16 Illustrations 



PAGE 



128 Mutations in the potato beetle 247 



129 Deer mouse 250 



130 Inheritance of color in the four o'clock 258 



131 Inheritance in Andalusian fowl 259 



132 Inheritance of ear length in rabbits 260 



133 Inheritance in guinea pigs 261 



134 Diagrams showing Mendelian inheritance of one, two and 



three pairs of characters respectively 262 



135 Hornless cattle 267 



136 Diagram showing osmosis 279 



137 Effect of diet on man 288 



138 Effect of diet on dogs 291 



139 Pursuit of food by Amceba 302 



140 Compass plants as seen from different positions 307 



141 Mimosa or sensitive plant 308 



142 Sundew leaf 309 



143 Sagging in a stem 310 



144 Relative amount of bending in stems due to unequal growth 311 



145 Effect of the kinetic drive on a soldier 322 



146 Effect of the kinetic drive on the tissues of the body . . . 323 



147 Sebright poultry, normal and castrated 326 



148 Relation of bee and flower 331 



149 Flatfish photographed on different backgrounds 334 



150 Protective form and color in animals 335 



151 Leaf insect 336 



152 Walking stick insects 336 



153 Dead leaf butterfly 337 



154 Imitation of an orchid by a mantis 338 



155 Skunk 339 



156 Porkfish 339 



157 Mimicry of monarch by viceroy butterfly 340 



158 Bumblebee mimicked by fly 340 



159 Mimicry in butterflies 341 



160 Mimicry of leaf cutting ant by tree hopper 341 



161 Antelope 343 



162 Male and female wood ducks 344 



163 Sexual difference in beetles 345 



164 Sexual difference in fish 345 



165 The "Albatross" 350 



166 A radiolarian 352 



167 Deep sea fishes on a light background 354 



168 Deep sea fishes on a dark background 355 



169 Angler fish and Chiasmodus 356 



170 Giant squid and tentacle marks 356 



171 Portuguese man of war 357 



172 Vellela 358 



173 Sunfish and crustacean larva 359 



