404 



INDEX. 



SEE 



Seeds con tin ued, 



the lower animals and man as the 



disseminators of plants, 88-90 

 Sensitive plants, of Brazil, 75 

 Sepia officinalis, 162 



its sucking disks, 162 

 Serpula contortuplicata, 168 

 Sexton, or burying-beetle, 221 



its intelligence, 221, 222 

 Shark, teeth of the, 251, 252 

 Sheep, dentition of, 343 



stomach of the, 344 

 Siluridse, spines of the, 251 

 Siphonostomata, 176 



their habits, 176 



Sirius, its immense distance from the 

 earth, 7 



composition of its atmosphere, 8 

 Skimmer, black, bill of the, 295 

 Skinks, their mode of locomotion, 273 

 Skunks, their offensive fluid, 368 

 Sloth, structure of the, 329 



hand of the, 333 



its means of defence, 360 



its happiness, 380 



Slow, or blind worm, its hybernation, 



282 



Slugs, 155 

 Snails, 154 



their winter defence, 156 

 Snake-stars, 133 



their means of separating them- 

 selves into pieces, 133 

 Snakes, their locomotion, 271 



the active colubridse, 277 



poison teeth of the serpent, 277 



their enemies, 284 

 Snow, causes of, 28, 30 



its protection of animal life, 32, 33 



importance of its loose moveable 



nature, 33 



Social wasp, nest of the, 230 

 Sounds, the air considered as the bearer 

 of, 19 



the voices of nature, 19 

 Sphalax typhlus, his blindness, 351 

 Spiders, 235 



their venomous apparatus, 235 



their mandibles, 235 



their spinnarets, 236 



uses of their spinning organs, 236, 



237 



the garden spider, 238 



the patience of spiders, 239 



hunting spiders, 240 



trap-door spiders, 240 



water spiders, 241 



the raft spider, 243 



enemies of spiders, 244 



their fecundity, 245 



their parental affection, 245 



SWI 



Spiders continued. 



their use in the household of nature, 



246 



the eyeless kinds, 246 

 Sponge-crab, 185 

 Sponges, 112 



their animal nature, 112 



their organisation, 112 



their skeletons, 112 



their oscula, 113 



their sensibility and spontaneous 



movements, 114 



their mode of propagation, 114 



their economy in the household of 



the seas, 115 



Spoonbill, beak of the, 296 

 Springs, formation of, 29 

 Squirrel, structure of the, 331 

 Stalita tsenaria, instincts of the, 246 

 Star-fishes, 134 



their locomotive apparatus, 134 



mechanism of their suckers, 135 



their skeleton, 135 



their prey and their enemies, 



135 

 Star-gazer, its mode of taking its prey, 



262 

 Starry vault, splendour of the, 2 



first step to a knowledge of the, 



2 



our ' world-island,' 8 



vast prospects into space and 



time, 9 

 Stars, fixed, their enormous distances 



from the earth, 7 



their swiftness of motion, 9 

 Stars, shooting, 5 

 Steinbock, agility of the, 328 

 Stems of trees, 65 



Stentor Kceselii, 106 

 Stickleback, defences of the, 250 



its parental affection, 266 

 Sting-rays, 251 



Stomach of ruminants, 345 



Stomatopoda, 177 



Storks, intelligence of, 315 



their migratory instincts, 315 

 Sturgeon, their migratory instincts, 248 



their size, 249 

 Sun, the setting, 1 



its distance from the earth, 3 



Bunsen and Kirchhof s discoveries 



of the composition of the solar 

 atmosphere and of the sun's cen- 

 tral orb, 6 



motion of the solar system, 9 



the heat of the sun the cause of the 



ventilation of the atmosphere, 17, 



18 



Swan, gizzard of, 299 

 Swimming birds, 292 



