INDEX 



267 



Sand-martin, 149 



Sardine, 117 



Sargasso Sea, 137 



Sunflies, 126 



Scarabseus, 128 



Schizopod, 29 



Scorpion, i2i 



Screamer, 102, 104, 153, 157 



Sea, carnivorous population of, 116 



food supply of, 117 

 Sea-anemone, 118, 236 

 Sea-bear, 87 

 Sea-birds, no, 152 

 Sea-cucumber, 119 

 Sea-gulls, 62 

 Sea-horse, 137 

 Sea-lions, 10, 87, 214 

 Sea-squirts, 118 

 Sea-urchin, iig 

 Seal, elephant, 194, 214 

 Seals, 10, 42, 87, 2 14 

 Sebaceous glands, 185 

 Secretary bird, colour of eggs, 154 

 Secretion of milk, 188 

 Seedlings, food of, 183 

 Selection, 58, 66, 70, 75, 113 

 Selenka, E., on embryology, 9 

 Selous' antelope, coloration figured, 90 

 Senses of vertebrates, 54 

 Serpents, 15, 83, 184 

 Serval, 85 

 Setter, 42 

 Sex, battle of, 207 



determination of, 203 

 Sexes, coloration of, 69 

 Sexton -beetles, 129 

 Sharks, eggs of, 139 

 Sheep, 75, 88, 219 

 Sheldrake, 107 

 Shells of eggs, 152 

 Shore-birds, 79, loi 

 Shrew, 49, 175 

 Silkworms, 205 

 Silurus, 137 

 Silver-fish, 33 

 Singing birds, loi, 108 

 Sitatunga antelope, 90 

 Size and duration of youth, 40, 47, 48 

 and food, 48 



Size and temperature, 48 

 Skin, 83, 105 



glands, 184 

 Skink, 145 

 Skunk, 72, 79, 87 

 Sloths, 178, 220 

 Sloughing by snakes, 83 

 Slow-worm, 145 

 Smell, sense of, 243 

 Smooth-hound, 139 

 Snails, 130 

 Snakes, 75 



breeding, 146 



coloration, 72 



eggs, 145 



fascination, 57, 202 



fear of, 199 



feeding of, 196, 197 



viviparous, 146 

 Snipe, 70, 78, 109 

 Sole, 22, 63 

 Solenostomus, 137 

 Somnambulism, 229 

 Song of birds, 252 

 Sound, reaction to, 250 

 Sparrow, 98, 115, 116 

 Speke's antelope, 90 

 Spiders, 15, 70, 71, 121, 123, 128, 205, 



230, 235 

 Spirits of youth, 244, 245 

 Spoonbills, 154 

 Spoon-feeding, 189 

 Spots of animals, 78, 81-85, 89, 92, 96, 



113 

 Squirrels, 147, 176, 177 

 Stampedes 252 

 Starfish, 23, 119 

 Starling, 103, 148 

 Stick-insects, 124 

 Stickleback, 129, 130, 136 

 Stimulation, 232, 235, 236 

 Stock-breeders, 58 

 Stomach, 187 

 Stone-curlew, 149 

 Stone-flies, 125 

 Storks, 49, no, 153, 161, 242 

 Stripes of animals, 78, 81, 82, 84, 89, 93 



95,96 

 Structure and colour, 113 



